PTFE stands for polytetrafluoroethylene, the chemical name for Dupont's trade marked "Teflon." You can find more at http://en.wikipedia.org/wiki/Teflon if ya want to.
Darren,
Lightly moisten (w/ saliva) the hemp then place the upper portion back on. Should be good as new. You probably need a touch more hemp/wax as well.
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