Ok, there's alot of secondary holders making use of RTV to adhere the glass secondary to a stationary position on the holder.... Some holders are wood, others PVC, and still others are metal (mostly likely aluminum).

Who's done stress analysis, with regard to the affects on the frontside accuracy, of the expansion/contraction of the various holder materials that contact the glass secondary which is constrained by the RTV?

Secondly, is the holder typically pressed into a bead of RTV, or, is it more typical to lay a series of beads on the ID and OD of the holder against the glass? (In the first scenario an RTV film resides between the holder and glass whereas in the second the holder material is in direct contact with the glass.)

Steven