This is just one option, but I happen to use Masterpak's bolt plates. A single closure includes top plate, bolt and threaded receiver plate. The steel plates are simple, and you could fabricate closures of your own design in house with a cold saw, drill press and a few custom jigs.
Great! Got those, and the MDO is on order . . . speaking of this: To seal the lid, I use an open-cell neoprene sponge in the form of an adhesive tape at 3/4" wide by 1/4" thick. . . . who supplies it? Thanks a bunch!
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