Originally Posted by thePiRaTE!! 
Did you successfully transplant the KA?
these are the answers to the logical sequence of questions you will ask with my first answer
- did you successfully transplant the KA to a K lens? -
NO,
each lens has slightly different machining, it is not a simple matter to swap out lens mounts. Also the contact block in newer lens mounts needs specific space allowances that don't exist in older mounts/lenses
- did you successfully convert a K mount to a KA mount? -
YES
After a fashion, I was able to succcessfully get an older lens (XR rikenon 50mmF2) to report maximum and mionimum apature to the body, and for the body to control apature directly
The site below details what needs to be done for apature communications
http://www.robertstech.com/matrix.htm
In addition, I added a spring loaded pin to the mount which could contact the A mode pin which is recessed on the body side mount.
- did exposure work correctly? -
NO
unfortunately K mount lenses have the apature diameter change linearly with the movement of the activation lever, where as KA lenses have the apature area change linearly with movement of the activation lever. this results in a converted K mount lens having exposure errors all over the place, since the apature is not controlled as it should be.