how to fix up bulkhead connector?

I come from the pinball/arcade hobby. It's typical, especially on late 70's/early 80's Bally and Gottlieb pins, to repin everything. Connector pins are only rated for so many plug/unplugs and the plating wears, oxidation, etc..cleaning them might be a band aid fix, but not the proper, long term one. Buy some decent crimpers, learn how to properly crimp, and repin.