I just bought an Es-Ex of the Bay and it's in awesome shape, except the pivot pin is a tad loose. I've tried tapping lightly with a hammer, I've tried tapping firmly with a hammer, I've even come dem close to banging with a hammer, and nothing happens. Nothing changes even slightly. Any advice? It's not all that bad, so I'm not that worried about it, I just figured if I could give it a couple taps and tighten it why not?