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cant figure out where the two larger screws go to fasten bottom to top collar. the bottom collar does not have tapped holes. its the rusty one in upper left. thx, bob
You probably got it by now, but that's why there is a ramped (out)side to the "box" which the square head tightens into. It IS tricky - the setup is more geared towards column shift where the lower collar rotates but seems kinda useless for floor shift.