> For the complete documentation index, see [llms.txt](https://ruka.gitbook.io/instructions/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ruka.gitbook.io/instructions/hardware/knuckle-assembly.md).

# Knuckle Assembly

## **Materials**

#### **Tools**

* Tweezers
* 1.5 mm Allen Key

#### **3D Printed Parts**

<table><thead><tr><th width="252">Part Name</th><th width="144" align="center">Total Quantity</th></tr></thead><tbody><tr><td>Assembled Finger</td><td align="center">3</td></tr><tr><td>Assembled Pinky</td><td align="center">1</td></tr><tr><td>Tophand Index + Middle</td><td align="center">1</td></tr><tr><td>Tophand Pinky + Ring</td><td align="center">1</td></tr></tbody></table>

#### **Hardware (Total)**

<table><thead><tr><th width="252">Part Name</th><th width="144" align="center">Total Quantity</th></tr></thead><tbody><tr><td>Dowel</td><td align="center">4</td></tr><tr><td>M2 x 4 mm Screws</td><td align="center">9</td></tr><tr><td>Extension Springs</td><td align="center">4</td></tr></tbody></table>

***

## Instructions

### Video for Single Finger Attachment

This video shows how to attach one finger. The process is identical for the other three fingers, with the shorter pinky going on the outer knuckle of Tophand Pinky + Middle Part.

{% embed url="<https://drive.google.com/file/d/1OAvQ8jlysJ-39z7iZaimDPrwRMFsqtkd/view?quality=hd&usp=sharing>" %}

### 1. Attach Spring

<table><thead><tr><th width="270">Part Name</th><th width="100">Quantity</th></tr></thead><tbody><tr><td>Extension Spring</td><td>4</td></tr><tr><td>M2 x 4 mm Screws</td><td>4</td></tr><tr><td>Tophand Index + Middle</td><td>1</td></tr><tr><td>Tophand Pinky + RIng</td><td>1</td></tr></tbody></table>

<table data-header-hidden><thead><tr><th width="317.328125"></th><th></th></tr></thead><tbody><tr><td><strong>Tophand Index + Middle</strong></td><td><strong>Tophand Pinky + RIng</strong></td></tr><tr><td><strong>x 2</strong> - M2 x 4 mm Screws</td><td><strong>x 2</strong> - M2 x 4 mm Screws</td></tr><tr><td><strong>x 2</strong> - Extension Spring</td><td><strong>x 2</strong> - Extension Spring</td></tr><tr><td><div><figure><img src="/files/mxVMb8vTFqC8NJD7SQWj" alt=""><figcaption></figcaption></figure></div></td><td><img src="/files/RkdZ40MpjF4veJpL0Ofv" alt=""></td></tr></tbody></table>

### 2. Route String and Insert Dowel

<table><thead><tr><th width="270">Part Name</th><th width="100">Quantity</th></tr></thead><tbody><tr><td>Dowel</td><td>4</td></tr><tr><td>Tophand Index + Middle</td><td>1</td></tr><tr><td>Tophand Pinky + RIng</td><td>1</td></tr><tr><td>Assembled Finger</td><td>3</td></tr><tr><td>Assembled Pinky</td><td>1</td></tr></tbody></table>

**Routing the strings:**&#x20;

Before inserting the dowels, route the two strings into the n

| **Tophand Index + Middle**                                                                          | **Tophand Pinky + Ring**                 |
| --------------------------------------------------------------------------------------------------- | ---------------------------------------- |
| **2 Assembled Fingers**                                                                             | **Assembled Finger and Assembled Pinky** |
| **x 2** - dowels                                                                                    | **x 2** - Dowels                         |
| <div><figure><img src="/files/JdCayO24l4dDVz8uyFTn" alt=""><figcaption></figcaption></figure></div> | ![](/files/eQK0jUrEKwMsbpibIFfw)         |

### 3. Secure Spring

<table><thead><tr><th width="270">Part Name</th><th width="100">Quantity</th></tr></thead><tbody><tr><td>M2 x 4 mm Screws</td><td>4</td></tr><tr><td>Index + Middle Knuckle Assembled</td><td>1</td></tr><tr><td>Pinky + Ring Knuckle Assembled</td><td>1</td></tr></tbody></table>

<table data-header-hidden><thead><tr><th width="257.9140625"></th><th></th></tr></thead><tbody><tr><td><strong>Index + Middle Knuckle Assembled</strong></td><td><strong>Pinky + Ring Knuckle Assembled</strong></td></tr><tr><td><strong>x 2</strong> - M2 x 4 mm Screws</td><td><strong>x 2</strong> - M2 x 4 mm Screws</td></tr><tr><td><div><figure><img src="/files/O3gZljEDNyOF4E8xtZTb" alt=""><figcaption></figcaption></figure></div></td><td><img src="/files/3N1edCVKeqMcRI17XuB2" alt=""></td></tr></tbody></table>

**At this point, you should have two assembled knuckle pieces, each with two fingers.**&#x20;


---

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