From the DK workshop, we have a comm cutter with the ability to cut commson sealed motors. Remove the endbell hardware and secure the motor with a dual lock system. I will be up front and say that because the threads on the dials are SAE threads you must be careful not to adjust too quickly unlike the normal comm cutters that have much "slower" threads. Countless hours spent building this and it works very well. I just no longer race and hate to see it sitting around collecting dust.
$275 shipped to the lower 48.