Unsure of the specifics of what JFettig was doing. Have no such issues here with sealing. The block clamps together very nicely, although I am using a 1/2" thickness of the material on the top plate. Fairly inflexible (for purposes of O-ring sealing) at that thickness. The stock material isn't totally flat from the shop though, and the pieces do get a run-over with a fly-cutter to flatten them out.
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