Thank you, Paul!
Here is another one. In 2010 I bought a Penti I with a brick of Orwo SL films. I took it on a walk some weeks ago and after the first frame the shutter stuck and something rattled inside the camera. Ever tried to open a Penti? Forget it! (Maybe I´m too dumb, but I read about similar problems with the Pentina)
At the end I used some force, and removed the lens. Looking around in my McGyver box I found the seldom used Holga lens for M4/3, which I had modified several times. I removed the "lens" and replaced it by the Penti glass. The new lens can be stopped down, but I have to do it from the backside with a toothpick or a pen.