When I go to put my lugs in, they begin to croak a little when it gets to the very end where it wont tighten anymore. I'm using a single-handed tire iron and not exerting that much force. I only go until it stops tightening and I'm a pretty skinny guy (so no intense muscular force on it). I have the standard wheel (steel) along with the OEM lugs. Is this something to do with the metal, is it normal, or am I doing something wrong?