So I finally got an hour or two to build my cables and stupidly, didn't measure the binding posts on my speakers before soldering. They can accommodate 14-12 awg, and the ends are pretty close to 10 awg. There are the obvious ways to deal with this (solder on bananas probably make the most sense), or cutting the solder joint to fit.
Anyone got some clever ideas to save me some time (and tracking down bananas)?