Kiev lens bayonet come off

[Eugen Mezei]

I got a nice Jupiter-12 in Kiev/Contax bayonet. Unfortunately the bayonet part came off.
I see on the lens 3 points where the bayonet was fixed by pointy screws. Put it back and tightened the screws external to the bayonet. This screws are not the ones fixing to the lens, so no wonder the bayonet came of again.

Do I need to dismantle the bayonet to get to the 3 pointy screws, fasten these to the lens barrel and than put the "cover" back?

What should I be avare of? Mark something before disassembling? Any springs or whathever flying around the room?

Eugen

 

[sevo]

Can you describe what bayonet component you mean, or can you post some pictures? From your description I don't even know whether the lock ring, bayonet flange, rear barrel or parts of the RF coupling tube have come loose. The Contax mount is quite complex, and has something like two bayonets which might detach in at least five different ways...

 

[Bill58]

When you figure out how to properly re-assemble it, put a thread locker (USA brand name- "Loctite") compound on ALL threaded surfaces. Get the kind that allows disassembly- not the permanent kind.

 

[Bill58]

When you figure out how to properly re-assemble it, put a threadlocker (USA brand name- "Loctite") compound on ALL threaded surfaces. Get the kind that allows disassembly- not the permanent kind.

Make sure the threaded surfaces are clean and dry of oil before application of threadlocker!

 

[wolves3012]

This page may help you:
http://www3.telus.net/public/rpnchbck/Jupiter-12 dismantle.html
It covers complete disassembly of the J-12, so you should be able to figure out where your problem lies.