Dave,
I have never replaced a spring in a Mec-Gar mag but I have replaced several of the plastic bases with wood bases. Never had a problem getting those pins out. The trick might be having a punch just the right size. I tap the pin out with a brass punch. I support the "exit" side of the magazine where the pin comes through with a tiny socket from a 1/4" socket set. Hope this helps. KFS
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