It depends on the size of the puck and whether or not it will hold enough beads to stabilize your humidor. Heartfelt Industries makes little holders for their beads that are about the size of a cigar. For a 20 count humidor you'll only need the smallest one at the top of this page Then you just wet the beads and drop the tube in your humidor and you're all set.
For the beads be sure to only use distilled water though.
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