Looking at the post on trem blocks made me think of a product I saw. THe groove tubes fatfingers sustain enhancer. Anyone have one? Does it make a difference? Has anyone made anything themselves that works.? I was thinking of trying to use my quick change capo and putting a couple silver dollars on each side to see if that does anything, but I need to get a couple silver dollars, or slugs, and I dont know if that's enough mass to make a difference.

I have one WW i call it the foul finger. Its effects are subtle to say the least. Its like putting the headstock of your guitar against a wooden table then playing. With the foulfinger you dont really hear it unless you put it on then take it off whilst some open notes are ringing.
I did find it makes a great way to clamp a tremblock onto the headstock which does make a marked difference.

you can just see it clamping a tremblock to the head of this guitar.

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i have a kyser capo on mine, i noticed a change...