The photo in my original post got lost, so I am repeating the OP with the image re-inserted:
I have been investigating ways I could continue using my K-30 in case it does succumb to the "aperture block" malady.
Dark exposure problems on K-30 or K-50? Read me first! - PentaxForums.com
The problem occurs when the camera attempts to "stop down", but apparently the mechanism fails to stop the aperture at the correct point, so it closes to its smallest aperture. An obvious solution is to prevent the lens from needing to stop down, that is, to keep it stopped down all the time. I've seen several guys here say that they had clipped the aperture lever for that reason, but that solution leaves me cold, because I hate to cripple a perfectly good lens that has survived in that condition for twenty years or more. Then I thought of my AdaptAll lenses. I did find someone here who modified an M42-mount to keep the lens stopped down
An Adaptall to M42 adapter modification - PentaxForums.com
That is a good solution, but as I examined my AdaptAll lenses, I realized there is another solution. If you look at the back of an AdaptAll lens
you can see a small button/lever {encircled in red in the picture above}; the adapter which specializes the lens for a particular mount transfers pushes from the mount to this button; block this button, and the lens stays stopped down, so I cut a small strip from a piece of thin plastic {such as flashing holding the "reward cards" to the right}, put that piece over the lever, and used a small piece of tape to hold it in place as I put the adapter on. I wouldn't want to take the adapter off again, but I have done this with two lenses {#23A 60-300mm f3.8-5.4 and #01A 35-80mm f/2.8-3.8} and this does seem to keep the lens stopped down {I took the picture above with the #01A, incidentally}