Bladerunner, I'm pretty sure it was the Boeing 777 project, their brand new long range wide body. Anyway, I am very sure they had numerous chemical engineers, plastics engineers, and mechanical engineers working on the exact formula and Boeing spent many millions of $$ and many weeks on research before they implimented their glue design. Obivously jaydee this isn't a viable option for you given your goal of economy in your blocks. Personally I think a Al base with a screw down Al top and a silicone O-ring is the best option for you. I know I for one would deffiniatly like to see this design better than anyother short of soldering the top.
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