Singer used the motor / hand crank mount for hand cranks before motors. I have an 1890's singer 28 and 1902 27 with the raised boss. Puzzling why Singer cast 27 heads with and without the mount, maybe there was an upcharge for this added feature.
For the Kohler, best bet would be to post pics of the machine and arm where the crank would mount.
Jon
Last edited by jlhmnj; 05-04-2013 at 12:32 AM.