Ok, maybe won't make a stand alone grinder and use the other grinder to power it.

Well......I went out and looked at the wheel itself. I could mount the wheel right on the grinder if I want to cut some of the guard away. If I ran an 8" wheel I'd have to cut A LOT of guard. I may be able to swing a six inch wheel without cutting much of the guard.

Honestly though, if I can knock the crown off the current wheel, is a 4" to 6" worth it?