I have an old, old lawn edger, 42 years to be specific. It's got a 2 1/2 hp bs engine and other that a little smoke still runs great. There are no markings on it whatsoever as to who the manufactorer is, but through my research so far I've narrowed it down to either a Murry, K & S, possibly King O Lawn, Cooper or McClane. And here's my problem. It needs a new head shaft. That is the shaft that connects the blade to the pulley. Can't find one anywhere. I've been told by local repair shops that someone used to make a universal shaft, which would be great if I could find one. I'm looking for a shaft that's 5/8" in diameter w/ 1/2" thread on one end, no steps (smooth the entire length) and at least 7" long. Can anyone help?