Re: Another ATM scope sees the light of day....err night :-)

[Richard Schwartz <richas@idt.net>]

For what its worth, I have used coarse sandpaper to clean the glaze off
of well-used pitch laps.   With light pressure, you can clean up the lap
and still avoid embedding grit in the pitch.   Clean up with COLD water!

To anticipate your next question, NO, I did NOT recycle the sanpaper by
cleaning it in my pressure cooker!

. . . Richard

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Date: Sat, 28 Nov 1998 09:36:45 -0600
From: jgmoreau@lino.com (Jean-Guy Moreau)
Subject: Re: Another ATM scope sees the light of day....err night :-)

>This happened to me too, recently. A whole lot of scratches appeared
and
the
>only thing I could think of to blame was a wire brush that I had just
used
>to scuffed the lap. It was an unused brush that I had bought special
for
the
>job, to avoid contamination. I hadn't finished polishing so went back
to a
>fine grind, and have now almost finished figuring with no further
scratches.
> Buck, your post has confirmed my suspicion that wire brushes (even new

>ones) shed, something.
> The question is now, how to treat the brush to remove rust or any
other
>contaminant. Soak it in oil? Perhaps some of the chemists on the list
could
>suggest a treatment that would sterilise the brush without creating a
new
>problem.  Do they make stainless steel brushes???


I use a BBQ brush, the kind with short stiff wires and a long handle,
apparently made of brass (?) so far without any scratch problems.

Jean-Guy