Just to clarify, Im talking about the CAR-11 piece that clamps to the shaft and has a bearing that the thread take up lever rides on.
The first time it broke was when tightening it to the shaft after replacing the needle shaft gear, the second time was when the needle shaft gear broke again, jammed up the rack gear, and I tried to gorilla the arm up. Cant remember what the 3rd break was, by then I was so frustrated I couldnt think.
So now I have a warehouse full of extra parts just to avoid the downtime I was experiencing.