Opinions sought on odd engine knock

Very good and thanks for the comment; I was outside splitting some wood (good cold weather work...) and took the time to put a little force on the crank end play. While I did not have a dial indicator on it, it looked to be beyond the spec of .002-.007"; maybe in the range of .012-.015" by eyeball. That could be the source of the rattly bottom end noise (the damper pulley wobbles a bit and that could be moving the crank in and out), but probably does not cause the start-up knock. It's probably a general wear indicator; I remember now that the oil that I got out of this thing had been seriously diluted with gas due to an unattended-to carb leak by the PO.