I assume you mean you peened the pivot pin too tight. If you work laping compound it might not work or it might work too well in either case you may not get it all out leading to premature loosening of all working parts. Your best bet is to carefully take it apart and redo it. Or if the folder works, carry it for a while use it regularly and see what happens; I peened a pivot pin too much and am carrying it, over the last 6 to 8 months it has loosened some (still just a bit tighter than i think is ideal but not so tight that folks have trouble opening it).
ron