diff --git a/mechanism/BOM.md b/mechanism/BOM.md
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+# Bill of Materials
+
+## Servo
+
+Servo is the key component. I use TowerPro [MG92B](http://www.towerpro.com.tw/product/mg92b/). It has metal gear (important!).
+An hexapod requires 18 of them.
+
+> The dimension of 3d printed part is highly depended on servo's dimension.
+> Modification is required if you want to use other alternative servo.
+
+> TowerPro MG92B can be found on Ebay seller [servohorns959](https://www.ebay.com/usr/servohorns959), which is listed on TowerPro official website ([Link] (http://www.towerpro.com.tw/about-us-2/)).
I also got mime servo from him.
+
+
+## 3D-Printed
+
+### Body x 1
+
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+body_top |  | 1 |
+body_bottom |  | 1 |
+body_center | Under construction | 1 |
+body_side_wall | Under construction | 4? |
+body_back_wall |  | 1 |
+
+### Leg x 6
+
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+thigh_top |  | 1 x 6 |
+thigh_bottom |  | 1 x 6 |
+joint_cross |  | 1 x 6 |
+joint_top |  | 2 x 6 |
+joint_bottom |  | 2 x 6 |
+leg_top |  | 1 x 6 |
+let_bottom |  | 1 x 6 |
+foot_top |  | 1 x 6 |
+foot_bottom |  | 1 x 6 |
+foot_ground |  | 1 x 6 |
+
+### Tools
+
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+tools_mount |  | 1
+
+## Others
+
+Name | Spec | Thumbnail | Required | Note
+---- | ---- | --------- | -------- | ----
+Screw | M2 6mm |  | 54 | Servo Arm: 1 x 18
Joint: 4 x 6
Thigh: 2 x 6
+Screw | M2 12 or 10mm |  | 6 | Thigh: 1 x 6
12mm is better
(10 is also ok if 12 is hard to find)
+Screw | M2 30mm |  | 36 | Servo: 2 x 18
+Nuts | M2 |  | 36 | Servo: 2 x 18
+Bearing | 8x4x3 mm |  | 18 | Servo: 1 x 18
+Cooper/Aluminum Tube | 6 (height) x 4 (dia.) |  | 18 | Servo: 1 x 18
diff --git a/mechanism/README.md b/mechanism/README.md
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## Bill of Materials
-### Servo
-
-Servo is the key component. I use TowerPro [MG92B](http://www.towerpro.com.tw/product/mg92b/). It has metal gear (important!).
-An hexapod requires 18 of them.
-
-Note.
-The dimension of 3d printed part is highly depended on servo's dimension.
-Modification is required if you want to use other alternative servo.
-
-Note.
-TowerPro MG92B can be found on Ebay seller [servohorns959](https://www.ebay.com/usr/servohorns959), which is listed on TowerPro official website ([Link](http://www.towerpro.com.tw/about-us-2/)). I also got mime servo from him.
-
-
-### 3D-Printed
-
-#### Body x 1
-
-Filename | Thumbnail | Required |
--------- | --------- | -------- |
-body_top |  | 1 |
-body_bottom |  | 1 |
-body_center |  | 1 |
-body_side_wall | | 4 |
-body_back_wall |  | 1 |
-
-#### Leg x 6
-
-Filename | Thumbnail | Required |
--------- | --------- | -------- |
-thigh_top | | 1 x 6 |
-thigh_bottom | | 1 x 6 |
-joint_center | | 1 x 6 |
-joint_top | | 2 x 6 |
-joint_bottom | | 2 x 6 |
-leg_top | | 1 x 6 |
-let_bottom | | 1 x 6 |
-foot_top | | 1 x 6 |
-foot_bottom | | 1 x 6 |
-foot_ground | | 1 x 6 |
-
-#### Tools
-Filename | Thumbnail | Required |
--------- | --------- | -------- |
-tools_mount | | 1
-
-### Others
-
-Name | Spec | Thumbnail | Required | Note
----- | ---- | --------- | -------- | ----
-Screw | M2 6mm |  | 54 | Servo Arm: 1 x 18
Joint: 4 x 6
Thigh: 2 x 6
-Screw | M2 12 or 10mm |  | 6 | Thigh: 1 x 6
-Screw | M2 30mm |  | 36 | Servo: 2 x 18
-Nuts | M2 |  | 36 | Servo: 2 x 18
-Bearing | 8x4x3 mm |  | 18 | Servo: 1 x 18
-Cooper/Aluminum Tube | 6 (height) x 4 (dia.) |  | 18 | Servo: 1 x 18
+[BOM](BOM.md)
+
+## Leg Assemble
+
+
+
+
+
+## Body Assemble
\ No newline at end of file
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