I cut my old ultra pro fork and warped around once with masking tape to make it stay in the bars. Didn't have to hammer it in just put some pressure on it and it went in nice and snug. Its been in there for a couple of months and I'm having no problems. Bars don't rotate, no cracks, I don't have to tighten the scs super hard either. Hope this helps. Oh and I'm riding addict shredder bars if that helps.