I think the pin causes wear to the stock and bracket. I don't think there is much you can do about that, other than shimming the pin somehow.The pin would still need to move freely in order to fold/unfold the stock.... Also, there is a little nub that wears down at the base of the stock, where it butts up with the bracket. You could add some metal there to remove some slop, but if you add too much the stock may not be straight or lock up properly. I would build it up, then file it down little by little until it is straight and tight.