Re: sharpening tungsten, Friend just e-mailed me: "Sharpening tungsten is tricky and it wears out
aluminum oxide quickly. The best thing I've found is a cheap 6in. diamond lap in about 400
grit and mount it on the side of a regular bench wheel. Sometimes it takes a paper shim to
replace the hub pad and give the lap proper support." http://www.ebay.com/itm/New-6-Diamon...item5d2fa98641