| Author |
Message |
Mike Kovacs
| | Posted on Thursday, December 22, 2005 - 09:57 am: | 
|
Guys, I have a late model (black 1977) Jupiter-12 in LTM apart for service.
Optics and diaphragm are out, the last step is to separate the helical. I removed the infinity stop screw but something is still preventing the helical from separating?
Where to go from here? I was expecting it just to thread out. |
Glenn Middleton
| | Posted on Thursday, December 22, 2005 - 02:11 pm: |
|
On my earlier lacquered polished alloy version, after I had removed everything from the helical - scale,all visible screws etc, the helical did indeed just screw apart. I have an anodised version from an unknown factory that was difficult to separate, due to thread damage on the helical. The damage had obviously been done during initial assembly. I am sorry that this is not very helpful. I also gather that the later black models had slightly modified construction to keep manufacturing costs down. However on other lens types this modified construction actually reveals itself as painted/transferred scales, instead of engraved scales. |
Mike Kovacs
| | Posted on Thursday, December 22, 2005 - 02:32 pm: |
|
Glenn,
Its not a grindy kind of stuck stop, rather a solid metal stop. (helical is smooth, overgreased and overflowing with oil, but smooth) |
Mike Kovacs
| | Posted on Friday, December 30, 2005 - 07:13 am: |
|
Got this one sorted out - posted a little how to here:
http://www.beststuff.com/forum/read.php?f=21&i=35746&t=35735 |
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