After putting up with Mach3s quirky handling of A axis rotation for a few years, I finally decided to add a sliding ring type electrical contact for the four electrical lines that run to my heat sealing wheel. I've had too many jobs get screwed up from the cord wrapping around and strangling itself, and there was also wear on the insulation due to cord movement around tie points. So with a 3D printer and some copper sheeting I was able to make this home brew 4 conductor sliding ring setup and it works great! Now I can turn off the 360 roll over option on Mach and always get the shortest movement to get to the desired angle, and there is no wear on any of the wires. My 120 volt line was just about worn through and ready to short too, I made this change just in time!