Hi Mat,
The pin is likely bent, you would normally be able to tell on rebuilding though. The pin should be able to pass right through the holes in the arm and the bulkhead freely, if not then you have a bent pin. No lubrication necessary on the pins. Is the pin retainer at the front made of aluminium on your model? If not, this is the most worthwhile upgrade you would need. The parts you have replaced with carbon may be stronger, but with it they are more brittle and likely to snap rather than bend a bit like plastic ones. Not sure what would be the best for crashes, probably depends how hard the crashes are. Hope this helps.
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