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Summitar helical


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Hey all, I’m trying to disassemble my Summitar to clean the helical. It is a 1946 model. Now when I remove the three screws at the back nothing changes. There are two other indentations between the screws that don’t appear on earlier or later versions. Maybe this has something to do with it. Does anybody know how to get it apart?

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a photo showing what you mean would help.  There are 2 mechanical versions of Summitar, one with one grove on the tube and one with 2 groves. And with round and hex aperture.

Firstly you need to separate tube and pull it out. Then unscrew the ring then you can proceed with 3 screws and opening the helicoid.
Left photos show the newer version with 2 groves, right the older verions. Notice different mechanical construction of the tube and helicoid

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The two indentations between the screws. What are their purpose?

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May be these pins you see
 

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