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[Pix]

Success! the oiling worked! well, the WD-40 did the trick eventually:  


 


 
 
thank you so very much, Ethostech and Krp, for your time and efforts. today marks the end to the violence my K1000 should go through. now i face the task of putting it all together:
1. in the first photo you can see the weird red substance on the mount with some defects. what is it for, and should i clean it somehow?
2. the wires: just solder them?
3. the mount: should i buy another mount?
4. before putting it together: do i need to calibrate anything, like the light metering mechanism?  
5. any other advices?
 
thanks again! toda...
Tom.

[Ethostech]

Nope, Tom.   Unless the arrestor-pin hole  in the lens mount is damaged (unlikely) , you won't need to procure a new mount.
The corrosion (or whatever it is on the edge of the mount (your picture refers) may well be the result of some magic potient which someone has tried to inject into the arrestor-pin section  - and that may indeed have been the source of your current troubles.
 
May I suggest you leave the existing lens mount in position until you have the replacement pin and lever assembly on hand and ready to install.  You want to be able to reinstall all in one session and without disturbing the aperture coupling mechanism. Gently- Gently.
 
What you could do in the meantime is to trickle some WD40 into the seam between the silver front plate and the black portion from which you will need eventually to separate   By the time you are ready to proceed the WD40 should have destroyed the contact adhesive with which the silver plate is tacked on.

[Pix]

it is damaged - it won't pop back up. i think i will at least need to take off the mount to work things up with the spring & pin.
 
as far as i know, for at least 10 years no one had touched the camera, and no one ever tried to disassemble it like i did.
 
how can i disturb the aperture coupling?
 
and what is soft red spot?
 
thanks

[Ethostech]

As I mentioned in an earlier posting, you will have to remove the lens mount and the silver front-plate in order to install the replacement lever,spring and lens arrestor.  It is not a big deal - but it is better that you don't disassemble until you have the replacement parts before you.     You should have no difficulty in obtaining those bts and pieces from any camera techie in Israel.  Same with a replacement lens mount.   So don't waste time in extracting the  the old arrestor-pin out of the old mount. I doesn't matter any more.
 
When you have the replacement parts to hand, lay the camera on its back; remove the five screws and carefully lift off the mount.
You will then see a copper-coloured ring-washer with three humps which must align with mating machined receses in the back of the mount.     Lift it off - and then remove the silver front plate to install the new lever and arrestor pin assembly.
 
Reinstall  the silver front plate then reinstall the copper-coloured ring washer in the same position as was the old one.   The Mount fits in only one position - so the spring detents must be correctly aligned before you install it. Otherwise there will be no tension lens when you bayonet it on.
 
Tom - why don't you just buy those bits from a local Israeli camera repair man and get him to pop them on for you?
It is but a three minute job
 
The red spot on the Mount is a marker index.
To mount your lens, you align the red spot on the lens with the red spot on the lens mount - and then turn the lens clockwise to bayonet in position.   The arrestor-pin will  click into position to secure the lens.