From: Dominic-Luc Webb 
To: "John D. Upton" 
cc: Robert Fifarek , ATM List 
Reply-To: Dominic-Luc Webb 




You would need some very inhomogeneous pitch such that I have never seen or
to use some very coarse abrasive to cause any serious scratches. You can
just about polish glass with 600 grit on a polishing tool. If you are using
plate glass that was not properly bevelled, perhaps you got some small
chips from the edge? I suppose this could happen.

Dominic-Luc Webb
near Uppsala, Sweden

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