Think of it as "shiny to shiny" on each component connection of the bridge assembly? It doesn't need to be BIG - those wires are smaller than a ball point pen head in general, it need not be bigger than that if you know it is SHINY to SHINY when assembled.

So use your meter, and say a very tiny file and remove the paint, assemble it, and meter it, being careful to not get "where somebody will see it" size. After you do that once, you'll have a feel for how small it can be, and, as long as it shows connectivity, you're golden. The level of current flowing in guitars is generally so tiny that very very narrow gauge wire/contact points work fine.

Having said that, the American Man in me says "WTF MAKE IT THREE TIMES BIGGER THAN WHAT THEY ASKED FOR"