Shift Knob Insert for BMW vehicles

I have a custom wooden shift knob for my e30 and I was using a hacked up piece to let it sit on the shaft. This is going to be glued into my wooden shift knob so it will sit on the shaft correctly.

The outer diameter could be changed to fit a different shift knob design.

I'm not planning to update this file but let me know if you have suggestions or need a different file type.