This is what I use - it will not hollow grind and I don't feel that is important in the slightest.

This may not be the best in an absolute sense but it is so easy and fast that my tools are much sharper all the time as a result. It is quite affordable too.

http://www.acmetools.com/tools/WORK+SHAR...+Slotted+Wheel.


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BrentD, (Professor - just for Stan)
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[Linked Image from i.imgur.com]