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The shoulder hinges on mine were spotless until I started to transform him. Stress on the plastic started showing so I shaved and smoothed out the little bumps of plastic on hinges from both sides.
I did the same for his abdomen joint before stressing that part of him.

In summary, if it has a pin joint and is too tight out of package, breakout the exacto knife.
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I was reading the Generations Waspinator thread, and saw you came up with a potential fix for the shoulder stress problem. If you don't mind, could you explain how you shaved down and smoothed out the plastic on the hinges for both shoulders?

I'm a total newbie and have never modified a transformer before, so I'm a little cautious and would like to know what I'm doing so I don't accidentally ruin it.