Fixing a Porter Cable Finish Nailer

Fixing a Porter Cable FN250 finish nail gun. The bumper was in pieces and the part was discontinued with no replacement. I had to make a new bumper, replace the valve seal, and install an o-ring kit. See the links below for the parts and tools I used:
O-Ring Kit (some o-rings didn't fit my gun):
amzn.to/2P45l9D (affiliate*)
Valve Seal (883919):
amzn.to/2BLvl6E (affiliate*)
Bumper (651874-00, requires modification!):
www.mmtoolpart...
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