Keith Pitman
Subscriber
Zone VI sold a device, sometimes called a spider, that was two strips of wood hinged togather at a 60 degree angle. Equidistant from each other are three recesses: one for each tripod leg. Unfold the two legs of the spider, drop the tips of the tripod legs into the recesses, and your floors are protected.
There is a Zone VI tripod on Ebay now that shows the Zone VI "spider" in the picture. A simpler arrangement than the Berlenach, but the same concept.