Use polyethelene tops, overtighten a few turns with plyers and there is NO way it could ever leak and the top wont crack.
with accrylic/polycarb id use PTFE but use slitghly less than normal, and use sillicone sealant on the outside to be safe.
Copper top i would solder - why not? or use threaded with PTFE, never tryed that though....
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