shilmover
Well-known member
That's backspin. What kind of spinner are you using? Backspin can be caused by a few things, but is basically either your optipac or the fact you are using a serial port can't keep up with the spinner.
I have tried both a tempest like spinner (reproduction) and another (Oscar one, I think). No matter how slow I move it, this happens...
I can try a real tempest spinner to see if that make a difference...