Thanks, I made them.
There is a threaded shaft of stainless steel that runs though each half of the label clamp, holding the various bits together. In one half, the thread protrudes about 1/2" to act as a spindle to center the record, this then threads into an insert on the other half. The disc of the female half is allowed to slip when the two halves are twisted together, so they can be clamped together quite tightly.
The problem is the rubber gasket doesn't compress very well, so only the raised portion of the label is protected. Osmotic action causes water to seep in nonetheless, but only very little. I've modified the vacuum wand to dry out any accumulation under the gasket, but ofcourse some moisture remains on the edge of the label.
I think the expanded foam sheeting would do a better job, as it's highly compressible. I just haven't bothered with it as yet.
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How boring it would be, this endeavor
If all we heard was "perfect sound forever"