We have a Cherry Keeper short/wide w Headlock that we usewhen I'm travelling (i.e. plastic). Had to square off the headlock to make it more effective and sanded smooth as well. Also coated it w superglue (with a quick sand after) to seal the pores and reduce odor on longer wears. It works really well now.
Never thought to try the superglue tweak! Will definitely have to try that, it does seem to be quite porous. Thanks.Â