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What you do is up to you, how I usually try to fix this on old razors, is to tactically hit the pivot pin
if that fails, I will file down the pin and re-pin.

How I hit the pin is how I learnt it...

Either the scales are warped somewhere
or there's something about the pivot area, being it a crooked/bent pin
or just a bad peening job, too much pressure on a certain place which gives the blade a...