Originally posted by ovim I think Violini meant that then he can shoot in Av mode just like with M42 lenses. Without the aperture lever the aperture doesn't stay open when mounted on a cam.
I understand he would like to have Av mode and wants the lens to behave like M42, but from a practical point, the green button metering in M mode is the same, with 2 advantages, first you can focus wide open and the camera will stop down to shoot, so you don't have to worry about this yourself, and second, since exposure does not change often between shots, there is no need to have the lens function in stopped down mode, you meter once and are done with it for several shots, until lighting changes.
Even long before digital cameras, when I had cameras with aperture couplings, I would meter off a roadway or path or tree trunk, and stay in manual mode, as opposed to Av mode.
It is so simple once you start, there is no real problem.
Aside from that I don't see the point in damaging a perfectly good lens to make it work in stopped down only mode. At least not a K mount. I would consider it if I was swapping the mount of another system like Canon FD, Minolta MD or Nikon AI, and I have done this, because I sometimes find cheap but good lenses in other mounts and this is a way to use them effectively, but I would never modify a K mount lens, it is just not worth it.