One thing I found was to pluck low by the carriage at the bottom. Just like a base guitar would. The whole belt should resonate at the same freq regardless of where it was initiated. I get a more pure tone like that. Unfortunately, I’m only up to 34hz so far. I have to try to slip 2 more teeth through to get to 39 I guess.
Update! So I go to 38 now. I started with the belt locked in the carriage when the moving part was half it’s thickness installed in the dovetail. Then to get the screw to engage the nut I squeezed it into place and gave the screw a few turns. Once it was slightly below flush it hit 38hz. So a few more turns should get me to 39.
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