# Shaft Retention Assembly
The MAXPlanetary Base Kit comes with a 3in long rounded 1/2in hex shaft with a 10-32 tapped hole at either end. This shaft can be retained in the MAXPlanetary 1/2in Socket Hex Output with a screw installed from the back side before assembling the rest of the gearbox.
In addition to the included hex shaft, additional lengths of pre-tapped shaft are available from REV. Also, any length of team-provided 1/2in hex shaft (with or without rounded corners) can be retained in the output provided that it has a 10-32 tapped hole.
## Assembly Instructions
For assembly you will need a 1/8" Allen Wrench.
| | |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------- |
| 1) Line up the hex of the shaft and the output block. |  |
| 2) Insert the hex shaft in the output. Ensure that the shaft bottoms out in the socket.
Note: If the shaft has been cut, ensure that any burrs have been removed from the cut end, so that the shaft will fit in the output properly.
|  |
| 3) Apply thread-locking compound to the 1/2in long Button Head Cap Screw (included in the MAXPlanetary Base Kit or Hardware Kit).
Note: We recommend Loctite 243 (commonly known as “Blue Loctite”).
| 
\*not to scale
|
| 4) Insert the button head screw into the back side of the output.
Note: This is typically easiest with a hex key or t-handle WITHOUT a ball end.
|  |
| 5) Tighten down the screw into the threads in the end of the output shaft. |  |
{% hint style="success" %}
[You are now ready to continue assembling your MAXPlanetary Gearbox!](/ion-build/build-guides/maxplanetary-gearbox-assembly.md)
{% endhint %}
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