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You can find this info in this thread...
For Bartels' 5000 ~ 10000 (1200 ~ 2500 lines on wheel if it is directly coupled) ticks per rot of main shafts is good enough.
And yes, I do recommend EK box.
While the serial mouse interface can be used, it seems scope.exe has a problem with interrupt handling (generated by mouse driver) when pushing the scope while in track mode, resulting in missing position update (sometimes.. but once in the evening is once too many) and the scope loses the correct information on position it is pointed at.
EK box keeps this information locally (inside it's own microcontroller) so the information is always correct and can be updated on the demand from scope.exe
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