PM-30MV Spindle Lock

I liked Narosenberg's design, but it didn't fit my PM-30MV, so I redrew it. Same caveats he mentioned apply re: the spring return cup. My sense is that if the draw bar is not overtightened, things should be fine. I would check the tightness of the return cup nut occasionally, just to be sure. I printed in PLA with 100% infill, 5 walls and 5 top/bottom layers as I wanted some strength.