had my old friend, who has cut and put up thousands of bales of hay over the years come over and look at the mower.
one cycle of the pitman rod crank and he determined it's out of time.
but, with the book, he showed me how to move the shims around to correct the problem.
however, that is not going to be a 5 min job.
but, I do plan to try and retime the old mower, if possible.
he was amazed at how quite it runs, with old tractor idling at 400 rpm's