What did you fix today? (part 2)

[loccdor]

Our family had one of that very clock at our summer cottage in NW Ontario. Unfortunately, it went with the cottage (along with my summer stereo) when my parents sold it in the late '90's.

Nice to see a reminder of the clock.

They are beauties, I grew up with it and pretty much spent my whole life seeing it. Even though they were mass produced there's a level of care that went into their making.

 

[Rumbo181]

Here's the instructions I used, years ago.

I had to relubricate the helicoid and focus ring because they were so difficult to rotate that it hurt my fingers. The inner helicoid is easy, you remove the back, a few bits, and you can unscrew the unit from the front. Just make sure to note where it comes out or else you spend half an hour trying to find the correct position. Also, if the focus is smooth enough and the infinity focus is fine, I'd leave them alone. They're held together with a retainer ring instead of setscrews, and it's a finicky to re-tighten the ring without messing the focus.

Here's what I'm talking about.
On the picture, I'm pushing the outer helicoid counter-clockwise with a flat bladed screwdriver, as I'm tighting the retainer ring clockwise with a spanner wrench.

Many thanks.

It's not so hard to focus now, but I think it's just a matter of time before the helicoid becomes completely stuck. It seems to happen to every single CZJ Tessar sooner or later. Your instructions are useful and detailed, and I appreciate that you complemented them with your own experience.