Archived posting to the Leica Users Group, 2000/10/14

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Subject: [Leica] Glass front pressure plate?!
From: Dante Stella <dante@umich.edu>
Date: Sat, 14 Oct 2000 16:03:08 -0400
 
I was just opening a box of parts that  came along with a Leica meter M manual, and I came across a strange frame-and-glass combination.  It is a brass frame with screwholes on all four corners.  It holds a piece of beveled glass whose small-side dimensions about match a 35mm frame.  About 1mm separation from the small-side edges, there appear to be box channels (for sprockets)?  The side with the narrow side of the glass is black enamel; the part that looks like it would face the lens is brass.

Is this a front pressure plate for an M3?  If so, does anyone know how to install it.  My M3 is in the shop, so I can't tell if it will go on.

Does it help sharpness?

Ideas?!

Thanks