You are correct that small is signal and large is from ground and yes check continuity with your multimeter. On the 1/4 connector tip is left, the center sleeve is right and the bottom sleeve is ground you will have 1 wire for each signal and 2 wires going to ground. I would use a neutrik plug. Redco.com has a bunch of different options.
OK, I think i figured it out! I went with a Neutrik NP3X by the way
Thanks a lot!!!
Edited by Macmuffin - 11/24/13 at 3:19pm