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Doesn't it use expanding foam to make the sleeve expand into it? And then it takes structural adhesive to adhere it to the sleeve? I saw that in either in The Icar adhesive bonding or automotive foams class. Might have to pop it into my computer to refresh my memory. Unbelievable how they have a math formula to figure out where the foam will stop and expand as gravity moves it down inside a pillar. Pretty tech stuff. When I go back to production I'm going to Duane's. They do all that nerdy stuff by the book there.
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