Contax II bevel gear removal

[jgrainger]

Hello,

As the prewar Contax II is my favourite camera I've started buying broken examples - and some early Kievs with the intention of keeping a couple, and selling on the others after a proper (full disassembly) service.

Have had some practice on an incomplete Kiev.. but not removing the bevel gear which meshes with the top shutter roller.

I can see (and assume) that a screw seems to hold it together from the winding mechanism side.

Short of trying to broach/craft a small gear shaped ring spanner, has anyone found an easier way to stop the gear turning while trying to undo the screw - it doesn't look like there's an easier way but anyone can be prone to temporary blindness. Pressing some sacrificial leather on the shutter roller side isn't sufficient, and I don't want to damage a tooth by sticking a screwdriver in.


Thank you

Jonathan

 

[jgrainger]

Thinking about it, will have a go at fabricating a brass clamp this weekend - the type that's essentially like 1 piece of metal bent 180 degrees and circular in the middle.. hopefully it will work and fit in the space between the gear and the chassis.

Regards,

Jonathan

 

[jgrainger]

To finish off my initial thread, today I made a rough tool to try. As I'm planning on servicing a few I'll sort out a proper (and better finished) version in steel. The red on the gear teeth is some of the leather I tried using to grip it originally.





As pictures of cameras in bits are interesting, here are two more prior to being cleaned. It's initially difficult to believe there are a couple hundred? parts, but ignoring the many washers which divide into many more in the cleaner, just the bit under the wind knob is pretty complex - the part 1st from the bottom in the second picture is also a sub assembly within that stack - shown in a yet to be disassembled state.






Regards,

Jonathan

 

[richardHaw]

well looks like you already did it. in the watch repair business we use thick rubber bands for added grip and then just squeeze on the gear with our fingers. This is usually enough but before doing this we made it sure that we apply copious amounts of solvents or heat it with a soldering iron to help dislodge any hardened gunk. a calculated and gentle tap with a wooden mallet or a small peen hammer works, too. 😱😱😱

 

[jgrainger]

haha, I've a small and pretty hammer which mostly takes up room except for balance staking operations..

The rubber band idea is a pretty good one, I did try it with some leather but it was just getting torn up.