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The tridob has three az pads. One under the central fin at the back and two under the folding az bearings at the front. Dan Gray's design has four az pads, one in each corner.
I would always start with 15lb per square inch rule. You need to use virgin teflon. I used some generic teflon I bought a long time ago and was never happy with the azimuth movement using it. I replaced three of the pads with bearings, installed smooth formica and kept one teflon pad. This gave very nice motion for my scope.
Most flex rocker designs wind up with very large altitude bearings because you want to make the altitude supports short and stiff. Make sure you can accommodate this with your design.
Rod.
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