Bearing Spool Holder Mod

Modified the mounting shaft's nut slot's depth to work with my M3 nuts. Moved the end-stop from the bearing block to the mounting shaft so that the smaller holes on the end-stop would would catch the head of my M3 screws.

Instead of using two of the original bearing blocks, I used one of the original bearing blocks on the outside of the spool holder, and one of the modified bearing blocks with the modified mounting shaft to suit the hardware I had.