I purchased a teflon bearing set and Superlube for hypertuning the mount. First, I dismantled the Declination Axis and found several loose bolts and lot of sticky grease. I cleaned all the components placed the teflon bearings as advised and lubricated with superlube and assembled the axis, everything went very smoothly and now the Dec Axis is working better than before.
But things started getting wrong when I opened the RA axis, and I thought it was the easy part. Actually the RA axis has to bear all the weight that is put on the mount, that I learned the hard way, moreover the Ball-bearing had a slight wobble that I realized after I assembled the mount. With the counterweight and the scope attached, the RA axis suddenly started screaming and then stopped altogether. I quickly shut it off, and dismantled the mount again and found that the RA Axis shaft was bitten by the metal ring at the level of thrust ball-bearing. I cleaned it, made a few adjustments and assembled everything again, this time tightening the locking ring a bit further. At first everything looked fine but then again screaming and locking. I opened it again and found a complete ring of biting in the metal in the axis shaft. (photo attached).
Now I am lost, I dont know what to do. Should I replace the large Ball bearing or put back the plastic bearings and how to repair the shaft? Any help?