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spooling up a bearing with compressed air can result in very high rpm, and combined with comp air often being used to clean out a just cleaned bearing, there is little lubrication, so its basically dry. high rpm and dry bearing = not that good. just because you can, dosent mean you should :)...

It looks like a laminated bar, and not the pro version which has the removable nose sprocket assy. still, if you can get a replacement nose sprocket, then press out those 4 rivets, remove the remaining bits and pieces, clean, lube and fit new sprocket, and pein over the rivets and call it good.

What brand was it. ive seen high hr brand name bars with worn sprockets, which have been replaced. But ive also seen the cheap chinga ones fail rather regularly. dont think lack of lube is the issue, more of quality, or lack there of. If there is a hole, grease it, if there isnt, hit it with a...