I just looked, what I saw on July 76 was the same setup as November 1975 to May 76 only repainted by Charlie in June 76 for the up coming Destroyer tour and dress rehursals.
Concert footage:
http://thesexyarmpit.blogspot.com/2010/08/kiss-at-roosevelt-stadium-in-jersey.html
In only 3 months (November) it's destroyed again by the new "Destroyer" costume LOL.
Somebody (Likely one of the techs) had to keep it playing on the road. The bridge screw holes were likely shot and stripped so they went with a tailpiece to hold the strings tension. Gene also sweated like Niagara falls in that costume outdoor summer tour. I remember sweat trickling --literally pouring out from under that costume armor all over that bass that and floor that night (July 10th, 1976)
I think your correct about the rattle can at that point. It wouldn't surprise me if Gene himself **may** have used "Liquid Paper" correct-o-type for the binding on the tour bus. (he refused to fly on airplanes back then and would get bored as hell)