Makes my sweeps sound like a sweep and less of a ham sandwich. Sean is band on, in his description. There are some very good dedicated solutions to inhibit sympathetic string noise. I also use foam in my term cavity, but I've seen people insert small hosing into the springs too.
I use toilet paper behind my trem springs. I used to use foam but ran into an issue with the foam actually getting caught in the spring and making the trem not return to pitch. Have to be careful with that haha
Foam in your cavities and scrunchies round your nuts
The new drinking toast for guitarists?