diff --git a/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs b/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
index 8d7699112..2bb0fbd61 100644
--- a/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
+++ b/Assets/VRM10/Editor/Components/SpringBone/VRM10SpringBoneJointEditor.cs
@@ -59,12 +59,12 @@ namespace UniVRM10
             m_showJointSettings = EditorGUILayout.Foldout(m_showJointSettings, "Joint Settings");
             if (m_showJointSettings)
             {
-                LimitBreakSlider(m_stiffnessForceProp, 0.0f, 4.0f, 0.0f, Mathf.Infinity);
-                LimitBreakSlider(m_gravityPowerProp, 0.0f, 2.0f, 0.0f, Mathf.Infinity);
+                Vrm10EditorUtility.LimitBreakSlider(m_stiffnessForceProp, 0.0f, 4.0f, 0.0f, Mathf.Infinity);
+                Vrm10EditorUtility.LimitBreakSlider(m_gravityPowerProp, 0.0f, 2.0f, 0.0f, Mathf.Infinity);
                 EditorGUILayout.PropertyField(m_gravityDirProp);
                 EditorGUILayout.PropertyField(m_dragForceProp);
                 EditorGUILayout.Space();
-                LimitBreakSlider(m_jointRadiusProp, 0.0f, 0.5f, 0.0f, Mathf.Infinity);
+                Vrm10EditorUtility.LimitBreakSlider(m_jointRadiusProp, 0.0f, 0.5f, 0.0f, Mathf.Infinity);
             }
 
             if (serializedObject.ApplyModifiedProperties())
@@ -143,53 +143,6 @@ namespace UniVRM10
             return jointIndex == (spring.Joints.Count - 1);
         }
 
-        /// <summary>
-        /// スライダーと数値入力で限界値の違う、所謂「限界突破スライダー」を作成する
-        /// `EditorGUILayout.PropertyField` の代替として利用する
-        /// </summary>
-        private static void LimitBreakSlider(SerializedProperty property, float sliderLeft, float sliderRight, float numberLeft, float numberRight)
-        {
-            var label = new GUIContent(property.displayName);
-            var currentValue = property.floatValue;
-
-            var rect = EditorGUILayout.GetControlRect();
-
-            EditorGUI.BeginProperty(rect, label, property);
-
-            rect = EditorGUI.PrefixLabel(rect, label);
-
-            // slider
-            {
-                EditorGUI.BeginChangeCheck();
-
-                var sliderRect = rect;
-                sliderRect.width -= 55.0f;
-                rect.xMin += rect.width - 50.0f;
-
-                var clampedvalue = Mathf.Clamp(currentValue, sliderLeft, sliderRight);
-                var sliderValue = GUI.HorizontalSlider(sliderRect, clampedvalue, sliderLeft, sliderRight);
-
-                if (EditorGUI.EndChangeCheck())
-                {
-                    property.floatValue = sliderValue;
-                }
-            }
-
-            // number
-            {
-                EditorGUI.BeginChangeCheck();
-
-                var numberValue = Mathf.Clamp(EditorGUI.FloatField(rect, currentValue), numberLeft, numberRight);
-
-                if (EditorGUI.EndChangeCheck())
-                {
-                    property.floatValue = numberValue;
-                }
-            }
-
-            EditorGUI.EndProperty();
-        }
-
         void OnSceneGUI()
         {
             if (m_root == null)
diff --git a/Assets/VRM10/Editor/Components/VRM10ObjectLookAtEditor.cs b/Assets/VRM10/Editor/Components/VRM10ObjectLookAtEditor.cs
index 45576c5bb..3e53763af 100644
--- a/Assets/VRM10/Editor/Components/VRM10ObjectLookAtEditor.cs
+++ b/Assets/VRM10/Editor/Components/VRM10ObjectLookAtEditor.cs
@@ -27,10 +27,8 @@ namespace UniVRM10
             {
                 EditorGUILayout.LabelField(_name);
                 EditorGUI.indentLevel++;
-                // EditorGUILayout.PropertyField(_CurveXRangeDegree);
-                _CurveXRangeDegree.floatValue = EditorGUILayout.Slider("CurveXRangeDegree", _CurveXRangeDegree.floatValue, 0, 90.0f);
-                // EditorGUILayout.PropertyField(_CurveYRangeDegree);
-                _CurveYRangeDegree.floatValue = EditorGUILayout.Slider("CurveYRangeDegree", _CurveYRangeDegree.floatValue, 0, yMax);
+                Vrm10EditorUtility.LimitBreakSlider(_CurveXRangeDegree, 0, 90.0f, 0, 90.0f);
+                Vrm10EditorUtility.LimitBreakSlider(_CurveYRangeDegree, 0, yMax, 0, 90.0f);
                 EditorGUI.indentLevel--;
                 EditorGUILayout.Space();
             }
diff --git a/Assets/VRM10/Editor/Vrm10EditorUtility.cs b/Assets/VRM10/Editor/Vrm10EditorUtility.cs
new file mode 100644
index 000000000..4df9bfba3
--- /dev/null
+++ b/Assets/VRM10/Editor/Vrm10EditorUtility.cs
@@ -0,0 +1,55 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace UniVRM10
+{
+    public static class Vrm10EditorUtility
+    {
+        /// <summary>
+        /// スライダーと数値入力で限界値の違う、所謂「限界突破スライダー」を作成する
+        /// `EditorGUILayout.PropertyField` の代替として利用する
+        /// </summary>
+        public static void LimitBreakSlider(SerializedProperty property, float sliderLeft, float sliderRight, float numberLeft, float numberRight)
+        {
+            var label = new GUIContent(property.displayName);
+            var currentValue = property.floatValue;
+
+            var rect = EditorGUILayout.GetControlRect();
+
+            EditorGUI.BeginProperty(rect, label, property);
+
+            rect = EditorGUI.PrefixLabel(rect, label);
+
+            // slider
+            {
+                EditorGUI.BeginChangeCheck();
+
+                var sliderRect = rect;
+                sliderRect.width -= 55.0f;
+                rect.xMin += rect.width - 50.0f;
+
+                var clampedvalue = Mathf.Clamp(currentValue, sliderLeft, sliderRight);
+                var sliderValue = GUI.HorizontalSlider(sliderRect, clampedvalue, sliderLeft, sliderRight);
+
+                if (EditorGUI.EndChangeCheck())
+                {
+                    property.floatValue = sliderValue;
+                }
+            }
+
+            // number
+            {
+                EditorGUI.BeginChangeCheck();
+
+                var numberValue = Mathf.Clamp(EditorGUI.FloatField(rect, currentValue), numberLeft, numberRight);
+
+                if (EditorGUI.EndChangeCheck())
+                {
+                    property.floatValue = numberValue;
+                }
+            }
+
+            EditorGUI.EndProperty();
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/VRM10/Editor/Vrm10EditorUtility.cs.meta b/Assets/VRM10/Editor/Vrm10EditorUtility.cs.meta
new file mode 100644
index 000000000..2517d5419
--- /dev/null
+++ b/Assets/VRM10/Editor/Vrm10EditorUtility.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 4b75cffea6a5f03418a9a698a32c15cb
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
index 1e7109d2a..b7f0508d8 100644
--- a/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
+++ b/Assets/VRM10/Runtime/Components/LookAt/CurveMapper.cs
@@ -7,10 +7,20 @@ namespace UniVRM10
     [Serializable]
     public class CurveMapper
     {
-        [Range(20.0f, 90.0f)]
+        /// <summary>
+        /// v0.128.3 VRM10ObjectLookAtEditor
+        /// 
+        /// DegreeINput 0-90
+        /// </summary>
         public float CurveXRangeDegree;
 
-        [Range(0, 90.0f)]
+        /// <summary>
+        /// v0.128.3 VRM10ObjectLookAtEditor
+        /// 
+        /// EyeBoneDegree 0-90
+        /// or
+        /// ExpressionWeight 0-1.0
+        /// </summary>
         public float CurveYRangeDegree;
 
         public CurveMapper(float xRange, float yRange)