Summary

Having issues with the windows on my E82 BMW so designed this adapter to allow manual turning of the window regulator mechanism, adjusting the height of the window without using the motor.
The internal profile of the adpater suits a 3/8" square to 1/4" square drive adapter. This was so I could use my electric screw driver to drive the window up and down.
There is a 18mm external hex if you want to use that instead.

Although not tested, this will likely fit other BMW window regulator splines.

Printed in PLA, handled the task no bother.