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Glass -- a local glass shop.
My grit -- hunt a local astronomy club.

+1

One trick with Arkies is something like fine (8K) loose grit
or even a light spritz of 2micron diamond. Because an
Arkie is so hard it need not be lapped often... but it holds
the feel of...

+1

I might note/ add that the initial slurry will finish the
process as the early hone strokes with a razor
worry the slurry and the hone surface to finer bits.

After this the dilution...