Later in my career, I worked for a company whose principal technical strength was that they knew how to glue optics together in such a way that they NEVER moved, either thermally, or from shock. Detachment? The optic would break in an area besides the glue joint first. And the solution had little to do with the nature of which glue, which however was also optimized. These assemblies were flown in space, landed on the moon, and were in all U.S attack helicopters.
