Archived posting to the Leica Users Group, 2000/07/26

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Subject: Re: [Leica] Peeling R4 Bayonet
Date: Wed, 26 Jul 2000 19:58:34 EDT

In a message dated 7/26/00 7:22:39 PM Eastern Daylight Time, writes:

<< Yes there are tools and procedures to follow. On the Leica M you use a
 special tool to check for the proper distance which involves using "gauge
 set 56". Tolerances are +0.005 mm. to -0.01 mm. The lens mount can be
 machined and then you have to carefully use an auto collimator to check for
 parrallelism. I do not have an "R" manual but expect it is similar.
 John Collier >>

So then, you've corroborated what I said, that there is no designed-in 
adjustment (such as an adjustable plate or shimming) for the seating of the 
lensmount.  What you're saying, if I understand correctly, is that Leica's 
current manufacturing procedures are inconsistent to the point each mount 
requires re-machining by hand to achieve the necessary tolerances?  When is 
your manual dated?  I can imagine such a procedure being necessary in the 
days of the M3-2-4 but I truly shudder to think if it's still true today, 
given the contemporary work ethic, what the likelihood is there's actually 
someone at Leica service who actually does it "by the book" : (