I got my end mill flute grinding fixture hooked up to the air supply and have been practicing sharpening on a 3/4", 2 flute end mill. The fixture will "float" the spindle at about 5 PSI and essentially becomes frictionless, except for the flute of the end mill riding on the small post which keeps it oriented withe grind stone.
I began thinking about a fixture that would easily let me grind the bottom cutting edges of the end mill and had visions of a fancy collet holder with indexing, etc., that would let me sharpen a tool at any angle, any rake, any number of flutes, etc. But when I got to looking for suitable material, my practical side kicked in (some might say it was my lazy side :-X) and I remembered this old, cheap Enco end mill sharpening jig I had bought years ago. After some searching I managed to locate it and after some head scratching, here's what I came up with.



Here's a couple of pictures of the lash-up I used to drill the holes for attaching the new base to the old one.


And, here's a picture of it sitting on my T&C grinder, ready to go to work as soon as I bolt it to the T-slot in the table.

Not real fancy, but it will do the job until I get the urge and the time to make something better.
Chuck