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I'm using 36 inches of 2.5mm SPP packing in a 2-inch CM still built using SD parts. I've been holding the SPP in place using about 4 inches of SPP scrubber sitting on top of a teflon gasket that's slightly undersized in the center, but I'm no longer happy with that approach (the gasket doesn't seal as well as I'd like).
I've considered other ideas, such as stringing a thin wire or two over the opening, under just a couple of inches of scrubber -- but I'm concerned about causing leaks in the gasket. I have an SD filter disc, but have heard it's not a good idea to use them to support packing.
If you're using a similar small sized SPP, I would be interested in hearing how you're supporting it.