Well I guess the new to me airplane is now officially mine as I've made my first mod to it. I wanted to have better tailwheel/towbar engagement.
So I ordered the following from Aircraft Spruce:
DELUXE CESSNA TAILBAR 13-01540 $53.95
and
AN6-42 Drilled Bolt
I then got some 3/4" 303 Stainless round bar and machined two bushings that were the same diameter as the bolt head, actually we turned the bolt head down just a tiny bit by taking the peaks off the bolt head so it would fit inside the TAILBAR a little bit easier. The Bushing were 5/8" each to make up the difference between the standard bolt AN6-30 and the AN6-42 bolts.
Here are the pictures, worked out great! Now the towbar goes on and stays on regardless if you are pushing or pulling and/or turning.
I may have lost 3/4 of a knot but I figure if I keep it waxed it will be a wash!
I hope I'm not severely chastised that the left and right side are not equal, so if you want to really impress your friends I'd shorten the bolt just a little bit and make the right spacer a little smaller.
Thanks for all the inspiration!