for headcups i actually have a threaded rod, two large washers on each end. And 2 nuts, stick the rod in the headtube so one washer is pressing against each headcup, grab yourself a wrench and turn the nuts in opposite ways. I have done this for many frames, using the classic sized headcup and once even the one i am currently using, zero stack. It cost me a grand total of 3.44 at home depot