Yashica 35 CC lens reassembly

[jameslittle]

I have disassembled the lenses of my Yashica 35 CC to remove lens fungus. Now all fine, except that I can't re-screw the helical (focusing) thread.

The two parts I am trying to get back together are the solid metal 'core' of the lens barrel, and the brass (?) ring that slides the lens in/out when focusing.

It should be really simple, but I just can't get it re-threaded. Have tried hot/cold approaches and varying degrees of force.

Any tips?

Thanks!

 

[jameslittle]

Having put this in the 'too hard' basket for several months, I have returned to it and successfully reunited the barrel components.

The key steps were:
1) thorough cleaning, by running through each groove several times with a thin wire, followed by a q-tip and solvent.
2) placing a tiny amount of lithium grease at the entry point of each groove
3) paying very close attention to the alignment to ensure that all threads are mated (inspect from all angles)
4) when confident that positioning was correct, I gave it a good twist to slide through the burring that had unfortunately formed from previous attempts.

Movement is now smooth, not quite perfect, but more than good enough for a beaten-up user camera!

Next step, recollimation...

 

[jameslittle]

image of rear of lens

image of rear of lens

In response to a PM, here is an image of the back of the lens, once the barrel has been removed from the camera body.