When I removed mine, they were set in a bed of what looked like gray, non-hardening "glazing putty" (don't know the technical term). The putty was still "workable"/soft and it seemed to have been effective. I don't know if it was original or a fix from some point in its history. I'd be interested to know what others have found and/or ended up using.
Thanks, MarkR
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Aluminumbskull with Led Balloon in Drag
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Birch Plywood and Aluminum go together like
Peanut Butter and Chocolate
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