Glue shaft on back case of CIM motor

[GeeTwo]

by "set the angle", it sounds like you have something with a limited number of degrees of rotation. If this is the case, wiring a potentiometer to an analog I/O port might do the trick. Mount it to one end of the shaft and couple the shaft to the pot's stem.

Edit: picture came up during drafting the above; this looks like what you have in mind.

I can't think of any legal issues with gluing it, but I would use something removable. If you do find a legal issue with glue or just want to avoid it, you could use a rubber stopper with a small hole as a "knob" on your potentiometer and mount it so that it pushes against the mini-CIM. If it 's not glued, you may need to recalibrate from time to time.