If u have the MK metal quick release bracket, just run your cable through the area created by the two metal plates. An OFC member shared this with me. I sandwiched a corrugated wire cover in there that the wire could slide in and then out a stopper on the wire. The wire will be loose from the shaft but it is the best option of many bad ones I researched.
I would not drill into the shaft!!!!!!
Nice TM motor btw.