Thanks Alex for the reassurance. I'l buy a new tube of goo so it's fresh and I'll still secure a mesh backing inside the alum tube first so it has more than just an edge retention. Scrub the finger idea. Shouldn't need to cut the adhesive. The alum tube will be secured to the wooden backing disk with three small screws so it can be pulled forward giving access to the interior for later work on heater install etc.
Got to be ready for mods ... always.
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