My understanding:
- Aperture lever does not move
- Currently mounted to TC, but won't come off
- Photo is of a standard K-mount
My take on the symptoms is that the aperture stopdown mechanism is broken inside the lens resulting in the jammed lever. When you mounted it to your TC, the lever slipped past the coupler in the TC and is stuck on the far side of nowhere.
The good news is that you did not attempt to mount this on a camera, any camera. The bad news is that is mounted on your TC. Unless someone has a better solution, you may have to disassemble the either the lens or the TC in order to salvage the TC.
In the mean time...DO NOT ATTEMPT TO MOUNT THE ASSEMBLY TO ANY CAMERA!
Steve
(Was in a similar position about a year ago with a defective Zenitar 16/2.8. The end result was a permanently damaged Ricoh XR7 film body...RIP)