I used a surplus furnace motor and a bit of MDF stock with a spline flange to hold the disk to the motor. I applied a velcro adhesive disk to the backing to make paper changes faster. The guide on the left is near a possible to 90 ° to allow me to clmp jigs to the table to tweak the fit of the segmented rings.
You can buy one for about $150.00 and up but I enjoy making things,
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