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Check to make sure that little rubber stopper is ALL THE WAY up when you want to use it as a pendulum. It can drag on the pendulum even though it looks like it's clear, that's really my only complaint about it. Could try some graphite lubricant on the sides of the pendulum if it's not the stopper that's dragging on yours.
Another thing is you can get some white tape and put it on the adjustment range (facing you) and have all the markers you want. Don't have to just use those three screw down ones that are mounted on it.
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