No idea, but I can say he was an astute individual (like Ringo, Ginger, Mitchell et all) and used a Ludwig double-tom mounting system.

Ringo used the best tom mount available--Rogers Swivomatic on his Ludwig drum set. In the 1960s, that was a very common adaptation by top drummers for whatever brand of drums they played.

Here is a close-up shot of the ludwig system.

It's the "new" Ludwig retracting double tom holder (781-1C) according to the 1967 catalog.

That's right, and the others did too. But at the time the Camco endorser was photographed, I'm going to guess that pictured Ludwig double unit was about as good as you could get. The early Swiv-o-matic Rogers produced was a Swiv-o-matic light and tended to Sway like Dean Martin. The later version was much better. Even so, that Ludwig unit was trustworthy in my experience. You didn't have to worry a lot about failure during the gig and it was as easy to set up as the Rogers mount - set it and forget it. The only thing they did have to improve was the lock on the bass drum diamond plate, but radiator clamps could rescue it.

And by the Way, that's why Camco was able to buy out George. His double tom holder was about as good as the one Harold "Doc" West is using in other post that's up right now. Hurting

I think Dan has solved the "Doc" West conundrum!!