diff --git a/interface/src/avatar/Avatar.cpp b/interface/src/avatar/Avatar.cpp
index 2f7ae62e2e..ebd7f017bb 100644
--- a/interface/src/avatar/Avatar.cpp
+++ b/interface/src/avatar/Avatar.cpp
@@ -940,7 +940,7 @@ static std::shared_ptr<Model> allocateAttachmentModel(bool isSoft, RigPointer ri
 
 void Avatar::setAttachmentData(const QVector<AttachmentData>& attachmentData) {
     if (QThread::currentThread() != thread()) {
-        QMetaObject::invokeMethod(this, "setAttachmentData", Qt::DirectConnection,
+        QMetaObject::invokeMethod(this, "setAttachmentData", Qt::BlockingQueuedConnection,
                                   Q_ARG(const QVector<AttachmentData>, attachmentData));
         return;
     }
diff --git a/interface/src/avatar/MyAvatar.cpp b/interface/src/avatar/MyAvatar.cpp
index 98b09d6c59..a5303b401a 100644
--- a/interface/src/avatar/MyAvatar.cpp
+++ b/interface/src/avatar/MyAvatar.cpp
@@ -1022,12 +1022,12 @@ void MyAvatar::useFullAvatarURL(const QUrl& fullAvatarURL, const QString& modelN
 }
 
 void MyAvatar::setAttachmentData(const QVector<AttachmentData>& attachmentData) {
-    Avatar::setAttachmentData(attachmentData);
     if (QThread::currentThread() != thread()) {
-        QMetaObject::invokeMethod(this, "setAttachmentData", Qt::DirectConnection,
+        QMetaObject::invokeMethod(this, "setAttachmentData", Qt::BlockingQueuedConnection,
                                   Q_ARG(const QVector<AttachmentData>, attachmentData));
         return;
     }
+    Avatar::setAttachmentData(attachmentData);
     _billboardValid = false;
 }
 
@@ -1165,21 +1165,25 @@ void MyAvatar::setCollisionSoundURL(const QString& url) {
     }
 }
 
-void MyAvatar::attach(const QString& modelURL, const QString& jointName, const glm::vec3& translation,
-        const glm::quat& rotation, float scale, bool allowDuplicates, bool useSaved) {
+void MyAvatar::attach(const QString& modelURL, const QString& jointName,
+                      const glm::vec3& translation, const glm::quat& rotation,
+                      float scale, bool isSoft,
+                      bool allowDuplicates, bool useSaved) {
     if (QThread::currentThread() != thread()) {
-        Avatar::attach(modelURL, jointName, translation, rotation, scale, allowDuplicates, useSaved);
+        Avatar::attach(modelURL, jointName, translation, rotation, scale, isSoft, allowDuplicates, useSaved);
         return;
     }
     if (useSaved) {
         AttachmentData attachment = loadAttachmentData(modelURL, jointName);
         if (attachment.isValid()) {
-            Avatar::attach(modelURL, attachment.jointName, attachment.translation,
-                attachment.rotation, attachment.scale, allowDuplicates, useSaved);
+            Avatar::attach(modelURL, attachment.jointName,
+                           attachment.translation, attachment.rotation,
+                           attachment.scale, attachment.isSoft,
+                           allowDuplicates, useSaved);
             return;
         }
     }
-    Avatar::attach(modelURL, jointName, translation, rotation, scale, allowDuplicates, useSaved);
+    Avatar::attach(modelURL, jointName, translation, rotation, scale, isSoft, allowDuplicates, useSaved);
 }
 
 void MyAvatar::renderBody(RenderArgs* renderArgs, ViewFrustum* renderFrustum, float glowLevel) {
diff --git a/interface/src/avatar/MyAvatar.h b/interface/src/avatar/MyAvatar.h
index 44823c9913..8c4bbcbba0 100644
--- a/interface/src/avatar/MyAvatar.h
+++ b/interface/src/avatar/MyAvatar.h
@@ -295,7 +295,8 @@ private:
     void setScriptedMotorTimescale(float timescale);
     void setScriptedMotorFrame(QString frame);
     virtual void attach(const QString& modelURL, const QString& jointName = QString(),
-                        const glm::vec3& translation = glm::vec3(), const glm::quat& rotation = glm::quat(), float scale = 1.0f,
+                        const glm::vec3& translation = glm::vec3(), const glm::quat& rotation = glm::quat(),
+                        float scale = 1.0f, bool isSoft = false,
                         bool allowDuplicates = false, bool useSaved = true) override;
 
     //void beginFollowingHMD();
diff --git a/libraries/avatars/src/AvatarData.cpp b/libraries/avatars/src/AvatarData.cpp
index 0015a064fb..af8e1c1cda 100644
--- a/libraries/avatars/src/AvatarData.cpp
+++ b/libraries/avatars/src/AvatarData.cpp
@@ -1085,12 +1085,15 @@ void AvatarData::setAttachmentData(const QVector<AttachmentData>& attachmentData
     _attachmentData = attachmentData;
 }
 
-void AvatarData::attach(const QString& modelURL, const QString& jointName, const glm::vec3& translation,
-        const glm::quat& rotation, float scale, bool allowDuplicates, bool useSaved) {
+void AvatarData::attach(const QString& modelURL, const QString& jointName,
+                        const glm::vec3& translation, const glm::quat& rotation,
+                        float scale, bool isSoft,
+                        bool allowDuplicates, bool useSaved) {
     if (QThread::currentThread() != thread()) {
         QMetaObject::invokeMethod(this, "attach", Q_ARG(const QString&, modelURL), Q_ARG(const QString&, jointName),
-            Q_ARG(const glm::vec3&, translation), Q_ARG(const glm::quat&, rotation),
-            Q_ARG(float, scale), Q_ARG(bool, allowDuplicates), Q_ARG(bool, useSaved));
+                                  Q_ARG(const glm::vec3&, translation), Q_ARG(const glm::quat&, rotation),
+                                  Q_ARG(float, scale), Q_ARG(bool, isSoft),
+                                  Q_ARG(bool, allowDuplicates), Q_ARG(bool, useSaved));
         return;
     }
     QVector<AttachmentData> attachmentData = getAttachmentData();
@@ -1107,6 +1110,7 @@ void AvatarData::attach(const QString& modelURL, const QString& jointName, const
     data.translation = translation;
     data.rotation = rotation;
     data.scale = scale;
+    data.isSoft = isSoft;
     attachmentData.append(data);
     setAttachmentData(attachmentData);
 }
@@ -1334,7 +1338,7 @@ QDataStream& operator>>(QDataStream& in, AttachmentData& attachment) {
         attachment.translation >> attachment.rotation >> attachment.scale >> attachment.isSoft;
 }
 
-void AttachmentDataObject::setModelURL(const QString& modelURL) const {
+void AttachmentDataObject::setModelURL(const QString& modelURL) {
     AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
     data.modelURL = modelURL;
     thisObject() = engine()->toScriptValue(data);
@@ -1344,7 +1348,7 @@ QString AttachmentDataObject::getModelURL() const {
     return qscriptvalue_cast<AttachmentData>(thisObject()).modelURL.toString();
 }
 
-void AttachmentDataObject::setJointName(const QString& jointName) const {
+void AttachmentDataObject::setJointName(const QString& jointName) {
     AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
     data.jointName = jointName;
     thisObject() = engine()->toScriptValue(data);
@@ -1354,7 +1358,7 @@ QString AttachmentDataObject::getJointName() const {
     return qscriptvalue_cast<AttachmentData>(thisObject()).jointName;
 }
 
-void AttachmentDataObject::setTranslation(const glm::vec3& translation) const {
+void AttachmentDataObject::setTranslation(const glm::vec3& translation) {
     AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
     data.translation = translation;
     thisObject() = engine()->toScriptValue(data);
@@ -1364,7 +1368,7 @@ glm::vec3 AttachmentDataObject::getTranslation() const {
     return qscriptvalue_cast<AttachmentData>(thisObject()).translation;
 }
 
-void AttachmentDataObject::setRotation(const glm::quat& rotation) const {
+void AttachmentDataObject::setRotation(const glm::quat& rotation) {
     AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
     data.rotation = rotation;
     thisObject() = engine()->toScriptValue(data);
@@ -1374,7 +1378,7 @@ glm::quat AttachmentDataObject::getRotation() const {
     return qscriptvalue_cast<AttachmentData>(thisObject()).rotation;
 }
 
-void AttachmentDataObject::setScale(float scale) const {
+void AttachmentDataObject::setScale(float scale) {
     AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
     data.scale = scale;
     thisObject() = engine()->toScriptValue(data);
@@ -1384,6 +1388,16 @@ float AttachmentDataObject::getScale() const {
     return qscriptvalue_cast<AttachmentData>(thisObject()).scale;
 }
 
+void AttachmentDataObject::setIsSoft(bool isSoft) {
+    AttachmentData data = qscriptvalue_cast<AttachmentData>(thisObject());
+    data.isSoft = isSoft;
+    thisObject() = engine()->toScriptValue(data);
+}
+
+bool AttachmentDataObject::getIsSoft() const {
+    return qscriptvalue_cast<AttachmentData>(thisObject()).isSoft;
+}
+
 void registerAvatarTypes(QScriptEngine* engine) {
     qScriptRegisterSequenceMetaType<QVector<AttachmentData> >(engine);
     engine->setDefaultPrototype(qMetaTypeId<AttachmentData>(), engine->newQObject(
diff --git a/libraries/avatars/src/AvatarData.h b/libraries/avatars/src/AvatarData.h
index 83195364bf..c23cbe9e5c 100644
--- a/libraries/avatars/src/AvatarData.h
+++ b/libraries/avatars/src/AvatarData.h
@@ -304,8 +304,9 @@ public:
     Q_INVOKABLE virtual void setAttachmentData(const QVector<AttachmentData>& attachmentData);
 
     Q_INVOKABLE virtual void attach(const QString& modelURL, const QString& jointName = QString(),
-        const glm::vec3& translation = glm::vec3(), const glm::quat& rotation = glm::quat(), float scale = 1.0f,
-        bool allowDuplicates = false, bool useSaved = true);
+                                    const glm::vec3& translation = glm::vec3(), const glm::quat& rotation = glm::quat(),
+                                    float scale = 1.0f, bool isSoft = false,
+                                    bool allowDuplicates = false, bool useSaved = true);
 
     Q_INVOKABLE void detachOne(const QString& modelURL, const QString& jointName = QString());
     Q_INVOKABLE void detachAll(const QString& modelURL, const QString& jointName = QString());
@@ -468,23 +469,27 @@ class AttachmentDataObject : public QObject, protected QScriptable {
     Q_PROPERTY(glm::vec3 translation READ getTranslation WRITE setTranslation)
     Q_PROPERTY(glm::quat rotation READ getRotation WRITE setRotation)
     Q_PROPERTY(float scale READ getScale WRITE setScale)
+    Q_PROPERTY(bool isSoft READ getIsSoft WRITE setIsSoft)
 
 public:
 
-    Q_INVOKABLE void setModelURL(const QString& modelURL) const;
+    Q_INVOKABLE void setModelURL(const QString& modelURL);
     Q_INVOKABLE QString getModelURL() const;
 
-    Q_INVOKABLE void setJointName(const QString& jointName) const;
+    Q_INVOKABLE void setJointName(const QString& jointName);
     Q_INVOKABLE QString getJointName() const;
 
-    Q_INVOKABLE void setTranslation(const glm::vec3& translation) const;
+    Q_INVOKABLE void setTranslation(const glm::vec3& translation);
     Q_INVOKABLE glm::vec3 getTranslation() const;
 
-    Q_INVOKABLE void setRotation(const glm::quat& rotation) const;
+    Q_INVOKABLE void setRotation(const glm::quat& rotation);
     Q_INVOKABLE glm::quat getRotation() const;
 
-    Q_INVOKABLE void setScale(float scale) const;
+    Q_INVOKABLE void setScale(float scale);
     Q_INVOKABLE float getScale() const;
+
+    Q_INVOKABLE void setIsSoft(bool scale);
+    Q_INVOKABLE bool getIsSoft() const;
 };
 
 void registerAvatarTypes(QScriptEngine* engine);