This is a remix of my earlier design that takes these 18mm square rubber inserts.

The QS-39 fits Vanguard tripod models Alta Pro 263AB 100, Alta Pro 264AB 100, SBH-100, SBH-250, SBH-50, Alta Pro 253CB 50, Alta Pro 254CB 50, Alta Pro 283CB 100, Alta Pro 284CB 100, Abeo 283AB, Abeo 323AB and Tracker 1, 2, 3 & 4.

It is compatible with both aspects of Vanguard's double locking system.

I used these tripod screws from Amazon. I recommend printing at 50% infill for a nice solid feel.