Ok while that shutter is out we can get to the rest of the camera.
So lets take a look at the front … time to clean the focus helicoid part. The Contax used a design were the focus mechanism of the 50mm lens is on the camera. The large focus wheel turns a helicoid in the body that moves the lens.
The front part (whatever you want to call it) is held on by four screws, note the top left one is short …. and another note, that there may be shims so keep an eye.
You can now pull this off the body.
Slowly turn the focus helix out and note its position when it is released … this will give you a hint when you put it back on.
Clean off the old grease, give it a good clean with a toothbrush.
Put on some new medium helicoid grease.
Now back to the top.
Take off rangefinder cover and other metal pieces … lift off the rangefinder tube and rangefinder windows … clean
Before putting focus part back in, lock it at infinity … then adjust the rangefinder focus with a really far away object.
OK, so the below image shows a new strap has been put on … and thinking about this further I really should have replaced both … another thing I forgot was to note the distance of the curtain opening.
Ok, so I was too busy putting this back together to photograph the process … so oh well.
Now, if you had removed the top curtain roller make sure that you had reset the shutter as noted by Richard Haw before you put it back on … very very important.
Wind up the tension on the bottom curtain … again Richard’s notes … follow them to set/test the shutter. If it looks OK then put some more turns on the lower roller … test the speeds … then put it all back together.
For those of you working on the Kiev versions you will find them similar … for those with the later Contax models, then things will be a little different.