Hi again, I finally got the M42 adapter for the lens as in pics above and it fits perfectly. Not a bad lens either. I recently also acquired a SMC Takumar f1.4 50mm which was originally attached to an Asahi Pentax ES film camera. I assumed it would also fit to an M42 adapter and it screws fine up to midway when it then starts to screech and have to force it all the way fully screwed which then makes it almost impossible to change the aperture. As shown in pics the thread of the Takumar (left) has a different front design to the Kimunor lens.
Could someone she some light into this.