Newer stainless link pin, and putting a bumper on the bottom tube instead of the top tube. With the rear bumper on the top tube you have a cross force on the linkage pin. Hammer pushing back, and the bumper pushing the bolt forward, with all the opposing forces centered on the linkage pin. With the bumper on the bottom tube you take the force off of the linkage pin. It's an easy fix, about 25 cents of rubber tube from the hardware store will let you make about a dozen bottom tube bumpers.
As for the valve pin, just DON'T DRYFIRE.
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