I've never had one like this, I just replaced the grooved discs with new ones every few years. After a while it adds up, with this device, with a little work, I can also smooth out worn wheels. Be sure to wear safety goggles as dust will fly up. A light touch works best when making multiple passes to get the desired result. Nice tool, only downside is the small short handle, I added a piece of 1/2" emt pipe and that fixed the problem. Works fine, just easier.
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