What's a Glendo?
What 600 grit wheel do you use?

The glendo is a small "power hone" that uses 5 or 6 inch diamond
wheels for sharpening. It turns very slow, perhaps 200-300 RPM.
The wheels appear unique and are probably custom. It will put
a mirror finish on any toolbit (carbide or HSS). It runs slow
enough that using diamond on HSS doesn't seem to be a problem.

They use to be sold by J&L and I bought one with one of their
famous 25% off sales, but it appears they sell direct now.
do a web search for glendo or accufinish. They are fairly pricely.

chuck