The Agfa Silette-LK is a vintage camera that operates without a battery, yet it features a semi-automatic light meter. The light meter operates electrically with a selenium cell, and is mechanically coupled to the exposure and ISO film speed setting.
This camera had the problem that the exposure and aperture could not be set individually. As it turns out, these settings were coupled by two plastic rings that were stuck together. The actual repair was simply applying sufficient force to the rings to make them unstuck. The difficulty was in disassembling the camera to get at these parts, so the force could be applied directly. Also, reassembling the camera turned out to be tricky.
Although we did not disassemble all parts of the camera, these pictures should aid anyone who wants to disassemble the same camera model.
There are two ways to access the lense part of the camera: From the back, there are four screws which hold the lense structure to the frame. We did not have the special tool required to remove the top of the camera, but I strongly advise to do that first, because reassembling is very difficult otherwise.
From the front, the focus ring shield can be lifted, revealing three screws holding the ring in place. After removing these screws, the focus ring can be screwed off (you will lose your focus calibration doing this), revealing several layers of interesing mechanics. Note that some of these mechanical plates reach into notches of lower or higher layers (in one case under slight tension). Be careful and do not apply any force here. The stick reaching into that slit from below will have to be pushed back a bit when reassembling.