unfortunately, in denver, they can't keep the things on the shelves at HF. so i had to mail order them.
tom, to start sharpening yourself, just go to find a 80 or 100 grit stone to attach to one side of the grinder and when starting out, it's as easy as grind the angle freehand (maybe using your index or index and middle finter to support it and find the bevel angle) and turn it. if you make a mistake, so be it, you can always correct it. and, yes, there's some frustration involved but you will see improvement.
sounds like you're turning a lot? or even if not, the time saved by doing it yourself will reap rewards. especially if you are turning a lot, because a dull tool can be more frustrating then learning the sharpening process. if you've already got the grinder, go for it! plus, i seriously doubt that you'll put the tool in to an unusable state. as long as you're creating some kind of sharp edge on it, you'll be fine for a few minutes at least! [
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