Originally posted by gordon_l34 The conversion will not be taking place as there is about twenty hours work in it owing to the complexity of the lens.
what ? twenty hours ? wtf ?!
I converted the same (OM mount to K) without the appropriate mount : i use a Pentax reverse 49mm adapter
PENTAX Reverse Adapter K reviews - Pentax Camera Accessory Review Database.
I had to do some screw hole, polish, find the correct flange, etc ... took me 2 hours. I didn't even have the appropriate screwdriver !
the lens : i had to use a wire to always let the lens @real aperture (so when i turn the aperture ring, the VF become darker of brighter) (gold wire on the bottom right.
i screw the Pentax reverse mount to to lens body.