well im installing momo pedals...drilled the two holes for the clutch, and put the two screws in the holes. i go to use the nuts they came w/, and they are not a conventional nut. they are only threaded about half way thru, and the other half is this white plastic, so you cant just turn them and turn them until the pedal is tight.... why are they like this? am I missing something, do I have to go out and buy new nuts?