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VERY common on them. Just adjust the cam, to compensate for the wear. You can loosen the right side (looking at front of motor) screw under the cam. The hole there is oval, to allow for adjustment. Adjust it, so that the throttle just starts moving when the arm is aligned with the hash mark on the cam.
I have never tried installing a roller on models that simply had the arm. Perhaps there is enough room for adjustment.
I used to simply pull from donor motors, but my stockpile of them is thinning. You could sleeve the bar, or simply make a new one. Sleeving over the wear is likely the easiest solution. Im not a pro welder, not sure if you could add a drop of weld there, then file smooth.