I try to eliminate the Backlash on my MF70. I came with the idea of "tightening" the threads. I plan to hand tap with a M6 6h tap. The rod is a 12mm brass rod and replace the PTFE nuts. This Upgrade implies to change the 6mm left threaded rod for a right threaded one. Please share your thoughts. If you think it could work, i will try to make it. PS.:That's not the real mesurments (the holes are too big, it was just a 3D clearence test) it's just the idee, the way i would do it. I didn't test the fit.You need : Do it : 1 - (Optional : help to drill at an angle of 90°) 3D print the dilling pattern 2 - drill to the right taping size 5mm for M6 & 2,5mm for M3 3 - tap the holes 4 - saw the two nick. 4*- clean the threads with the tap 5 - test the fit on the M6 rod & tighten to eliminate the backlash or any clearence / moves 6 - install 7 - run and comment