dismantling summaron m-mount 3.5cm f/3.5

dtkky

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Joined
Mar 30, 2009
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4
Hi,
I'm trying to dismantle this lens for cleaning. Repair book says to remove rear retaining ring first but the photos are not clear. I can see three rings at the rear (inner, middle and outer). Can anybody help me out as to which one to remove first?
Here is a photo of the rear. You can see what looked like a outer ring which is thick and flat with 2 holes diametrically opposite each other, a thimmer ring with 2 notches just inside the first one, and another thin ring with 2 notches adjacent to the rear glass element.[/ATTACH]
 
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