Re: Moongel Alternative
Worth noting that there is a difference between gel as a damper, and a napkin/kleenex pad held on with gaff tape.
Gel tends to vibrate with the head, so there is a more controlled dampening. Sometimes it's not enough, and which case either more is needed, or go to the napkin & tape, which really damps the head and provides a short, tight muffle.
Rings are another effect as well, attenuating the harmonics that live at the edge of the head, and accentuating the funamental punch.