I recently purchased a Norinco SKS in decent shape but with a bad creeping trigger pull. I've seen YouTube videos about how to shave down the sear in the trigger group assembly but the forward pin seems frozen in place. There's no visible rust and I've tapped it pretty hard with a brass mallet, still no movement. Any ideas about removing this pin without damaging the assembly? Thanks for any advice Also, what would be a fair price for a trigger job at a local GS if I decide not to do this myself?