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My top cap has a lip. A 1 1/8 downward protrusion that locates it snugly into the stem
Is it a heavy interference fit? No, it isn't, because it it was the cap wouldn't work in it's main role as part of the bearing preload adjustment. If it has only 0.01mm of radial clearance, that is enough to allow all of the aforementioned problems to manifest themselves.
gbj_tester
My top cap has a lip. A 1 1/8 downward protrusion that locates it snugly into the stem, so it stops the stem from being pinched more by the top bolt than the bottom.
So if that's the only reason I could run without a top spacer for moar HHSB points?