To make even more certain they are the exact same diameter, don't turn down both ends. Turn them out of a longer piece and then cut both off off it. Even if everything is done right there is a tiny chance of misalignment between the two end if turned around. Anytime you want EXACT concentricity between multiple parts, especially outside dimensions, make them ALL at one time, on the same piece of stock, THEN cut them out. Even a few tens out from a tighter chuck on one end can cause a difference in alignment. (Yes, home machinists hardly care about that much accuracy, but why settle for less when it is so easy to have NO differences?
Paul Andreasen

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