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my bad 2.7 arcseconds of belt lash is with the 52-teeth pulleys, the ones I rejected as being not ridiculous enough. I have 100-tooth pulleys which are going to be preposterous and also get the belt lash down to 1.4 arc min. so not 1.1 microns, 0.7 microns. The original setup was not one, not two, but three 8mm T2.5 MXL belts, each inducing 26.7 arcminutes of lash for a total of 80 arc minutes or 15 microns. It's abundantly clear that the original design relied heavily on closed loop feedback as that's, like, half a thou. Which is pretty nice for like a Haas VF-2. Which will also churn our a cylinder head, not a watch case. (haven't opened this excel file in a while...)