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Larry Root
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Mike,
Take a sock, reach inside to the toe, pull it HALF-WAY inside out untill the toe just sticks past the ankle. You now have a two-waled fabric sleave that's sealed at one end by the fold and open at the other (the ankle/toe). Cut off a several inch long piece of toilet paper tube and slip it over the toe but inside the ankle. Cut off the toe, slip your wrist into the opening, wrap a rubber band around your wrist. You now have the tube trapped inside the double walled sleave sealed by your wrist and the rubber band.
The drum shell replaces the toilet paper tube. Buy or make a "lay-flat tube" larger in diameter than the drum shell, it replaces the sock; the band clamp replaces the rubber band; the MDF disk, your wrist. If the MDF disk were flat sided, you'd have a heck of a time keeping the band on while you tightened it; by making the disk with a grooved lip, the groove will trap the band clamp and make it easier to seal. At issue would be how deep to make the groove -- more than a 1/4 inch and I'd worry that the folds in the plastic would create leaks, less than an 1/8 and it might be too shallow to make a difference: So I guessed a diameter difference of 1/4 - 1/2 inch between the center disk (the groove) and the two outer disks (the lips).
Hope this helps. If you've still got a question, I'll email you.
Larry
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