Ok, for those holders which use a piece of tube cut off to 45 degrees, is there a gap between the holder and glass in which the glob of RTV resides (holder not in direct contact)? Given what read above the answer is 'yes' and the thinner the better given the sag of the suspended glass and its effect on the non-rigid RTV, but, thin must only be used on objects that don't expand and contract large amounts. Is this because the RTV will lose adhesion from the repeated expansion/contraction of very dissimilar materials, less so with Carbon Fiber and Glass v. Aluminum and Glass?

So, if a 5" diameter Carbon Fiber tube were used (0.156" wall thickness) and cut to 45 degrees, and, a CF plate (0.100" thickness) adhered to the cut-off, then would many globs, uniformly spaced, on the plate give little to no deformation of the wavefront, relative to an aluminum plate, or what would the dot formation look like on the 5"ma plate to hold a 6"ma, 1.5" thick elliptical mirror? Or would the 5"me plate not be needed and RTV applied only on the 0.1" wall thickness of the 5" ma cut-off tube be enough?

Thanks, Steven