I have another ETX 125 jerking on right ascension movement. Many of us are accustomed to seeing this. The motor/bearing unit can no longer be bought. I know Andrew has been successful at disassembling these. I have repaired one or two, but most often I break the plastic bearing that is binding and causing the jerking.
I was thinking it might might be possible to abrade and loosen the bearing in some way without removing that little plastic gear that is so difficult (for me). Anybody got any thought on how that might be done?