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Perfect to dial in a new set-upI bought a Problem Solvers cable hanger and loved how easy it was to get the stem height and length set without having to readjust the headset with every change. Just move spacers and shims around then ride and try!! I was so happy that when I got ready to build a new bike that I ordered one of the locking spacers. It makes life easy. I don't have any problems at all with a 3mm sized allen head bolt except that were it 4mm it would be included on a Park 3 way. It's just an extra too to have to grab. No big deal.