story to tip: I have a small shaft on my fd bike, and needed a larger surface area to push against, so with the shaft being so small, I took the shaft collar I needed, found its o.d. and bought another collar with the i.d. equivalent to the o.d. of the needed one, but take it to your grinder opposite the set screw and make a small flat surface for the outer collar to lock onto tip: stacking shaft collars to equate a larger surface area, by grinding a flat on the smaller to lock the larger in place. oh and p.s. when you need something that screws together to stay together, there is no such thing as too much Loctite.