........ weave some soft rope or twine between the strings by the bridge.
That ought to mute them, depending on rope thickness, stiffness and
weight. Haven't tried that myself, as I said I'm just trying to be creative.
This is more or less what I use as well. Unlike foam, or the slow and
tedious MM built-in mutes, this is a quick-change thing. I leave it on
the ax all the time. When pushed right up against the bridge it has only
very minor effect, but since it's wrapped onto the strings I can pull it
forward from the bridge very quickly [mid tune, that easy] to produce
anything from reduced sustain to just plain thumpy thud.
If you're really fussy about intonation, never remove the "device" and
do a reintonation with it pushed up against the bridge ... since you
never remove it, you're now intonated. BTW, even a play who is NOT
fussy about intonation WILL notice that the MM built-in mutes wreak
havoc with intonation. I don't know why anyone would use them ...
except a really heavy dose of muting, where your notes are so heavily
muted that you can't hear how out of tune they are.
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OOOoops ... I forgot to consider that I keep strings on for years, so I
build on quite a nice muting assembly made of pony-tail scruntchies.
If you're into always using fresh strings, you wanna be more "down &
dirty" about your "device" since you gotta move/reinstall it every time
you do new strings ... with my device, "reinstall" means "rebuild" [not
really a headache, but if you change strings twice a month it might be
kinda annoying]. Also, if you're a fresh strings freak, maybe leaving the
mute parked by the bridge rather than removing it is not, in your tone
world, a "very minor effect". IOW, maybe you want every last milligram
of brightness and so leaving the mute in place is not an option for you.