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I couldn't find my ball peen hammer the other day when I was peening, and I remember you saying this a few times before, so I took the heaviest metal spoon I had and got to work...a bit slow, but...

I'm pretty certain that's how you tighten loose pins - although replace hammer with a small ball peen hammer and replace iron doorstop weight thingy with...just about any flat metal thingy :)