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I've seen those in action and they're pretty sweet - they can also be made relatively cheap - probably under $20. Maybe this winter time...
I roll the blank on a hard, smooth floorwith my left hand applying power to the tip, my right pressing down along several points along the blank to get it to "jump" to the right spot and then dial it in the rest of the way. I applied the pressure along several points and it was pretty consistant....
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