The extractor on my Sig GSR 1911 has finally given up the ghost, and Sig CS told me it had too many rounds for them to fix it under warrantee. So I bought aftermarket parts (faster and less $ than from Sig). But the real problem is I can't seem to get the retaining/pivot pin out. Tried a pin punch and a hammer, doesn't seem to move. So do I just need a bigger hammer, or is there some trick?