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Hard to judge the bushing without seeing a picture of the driveshaft installed through the bushing… That being said, most of these 10hp small gearcases show some wear in that area, so reusing the pieces is a judgement call indeed. I surely have reused driveshafts that look like this provided the fit through the bushing is still fairly snug… Driveshafts for these models, in good shape, are getting hard to find for sure.
Sometimes photos are misleading, which may be why we were alarmed…Be sure to check/change the gear lube frequently once reassembled. Alot of power going through this gearcase, it will not tolerate any water intrusion at all. I guess my question now is why did the original pinion get destroyed like that? Was the gearcase full of water when you got it?