dense foam like used to seal around outside dryer vents: you can cut and resistant to deterioration. To disassemble yo will need to drill and tap the posts and use a washer with screw to hold plate.Use a tread lock to seal and prevent movement. I try not to enter air chamber but not a huge issue if you do just use proper length screws so AS NOT TO AFFECT AIR FLOW, You can also tap the hole where the push pins were if you like. Biggest problem is that these can suffer from zinc pest and if present casting is worthless. Also some impellers were delicate castings as well (earlier ones) and then they went to sheet metal impellers. I have pics of all there and can post if you want
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