? Watts for blob on wham spring holder?

[zeppenwolf]

My guitar has an ABM Tremelo; it's pretty much the old timey, regular deal: in the body with three springs, (out of five spots available). The springs go from the trem flange to a piece of metal held to the body with two monster screws; the ground connection is made to that piece of metal. It's about 1mm thick, steel, I guess, and a couple square inches total area before it was bent & tweaked.

How many watts of soldering iron will I need to do a *nice* job of replacing the ground wire connection on that thing?

Eden