My domino has paddles, so I'm not 100% sure of the pin version, but doesn't the whole pin/spring assembly unscrew from the fence casting so you can clean it up?
Well, I got it working. Had to pull the motor/cutter assembly off and remove the extractor port to get at it, but a small Allen wrench did indeed succeed - I also spritzed some WD040 on the pin and twisted it around a while and all seems well.