Still getting the "show all content" dialog on my end - IE11 on 7 pro 64
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I was able to make a counterbore by carving a 5/16" drill bit.
I'm finding cheap diamond disks from China help keep the tools cooler during grinding.
The arbor for these are of no use (they will destroy a decent collet!) but the disks fit the Dremel arbor.
They will cut just about anything.
http://www.ebay.com/sch/i.html?_from...wheel&_sacat=0