OK, for now I will use 555. The reason I changed to XTL and 4060 was to avoid frequency variations of the WIRE signal generator, also equal shape of the square wave. I at least knew the WIRE signal would stay the same.
I wound lots of COILs when I was experimenting with them about a year ago, they all tended to be different (windings, thickness of wire, capacitors), They were in the hundreds of turns. As for length! I don't know. Once wound I would connect the capacitor, and unwind the COIL till it was tuned. I found the COIL winding a problem of frequency change as they settle after winding, I tried glueing the COILs then heatshrink to hold them. All tuned to 55930Hz.
I never thought I would be asked about them.