I recently made my armature rotaries with the option of an adjustable stroke. They come with a fixed 4mm stroke as a standard, adjustable is a free option on my machines.
here is a demo on how it works Adjustable stroke demo Dan Kubin Rotary

here is a short demo of some color packing with the standard 4 mm stroke Color packing with Dan Kubin Rotary


I have developed this machine to where it is at over a 7 month period, and it is finally at a point that I am happy with, and will be my stock model armature rotary. they sell for $350, and I offer a one year warrantee on the motor or any other parts. after that, I will replace and do maintenance on the machine for the cost of parts and shipping.

I will have a website up soon www.dankubin.com -but for now, Facebook is the best way to contact me www.facebook.com/dan.kubin