So... this is almost the first post I mention a guitar. Guitar is my main instrument.
The first thing someone will actually think is "What the hell is guitar mass?"
Guitar mass can be spotted by the extremely disturbing sound comes off your sound system, which sounds like "bzzzzzzzzzzz". Yeah.
And after you put your hand on the bridge/strings, it disappears. What?
So, the idea is to connect the bridge to the electric part inside your guitar body.
If you have a contour body guitar, it probably has a one-way locked bridge. The only thing you have to do is to get a copper cord, and connect the bridge with the part inside your guitar. Just get the cord, solder it on the bridge, and then solder it on the electric part inside the body.
But what if you have the Les Paul-like guitar like me? The bridge is totally not connected with the electric part inside, neither there is a hole so you can put it through and connect it?
You will have to connect the bridge with the pickup. At least that's what I do.
Connect the bridge to the pickup cord with a copper cord, but instead of soldering with resin, solder it with iron. It will probably reduce the mass even more.
I am not an expert when it comes to modifying guitars, so there are lots of trick I don't know. But I did this and it worked fine for me. I hope it will do for you too.
3. Warning. As always.
This is not a professional blah blah blah... Try this at your own blah blah blah.