To: atm{at}shore.net
From: Jim Burrows 
Reply-To: Jim Burrows 


At 17:03 2003-04-13 -0500, Jerry B. Hillman wrote:

>And sometime in the last wet I aquired a scratch.  It is about 3 inches
>and about the thickness of a human hair. I can just feel it with my
>fingernail.  So how far back should I
>go to grind it out?

Where is the scratch on the mirror?  If under the diagonal shadow, forget
it (obviously).  If it's radial, maybe it could hide under a spider vane. 
Probably wouldn't hurt anyway, considering it's an infinitesimal fraction
of the area of that BIG mirror.  Also, what's the state of polish on the
mirror? - if almost done, the benefit/cost ratio of going back to grinding
gets pretty small - just think of getting another scratch after going
through another grind-polish cycle.

         -- Jim Burrows
         -- mailto://burrjaw{at}earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)

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