Locking connectors (Molex C-Grid) are available in sizes to fit two to 25 wires. I buy mine from Digi-key (
www.digikeu.com) page 124 in the sep-dec 2006 catalog. You can also search their site, the three wire connector shells with built in latch are part numbers wm2901-nd and wm2434-nd. You will have to buy the crimp terminals listed on page 125, part numbers depend on wire size and if you want tin or gold plating and a crimp tool will be needed. I have used these connectors for years with no problems. I use the multiple pin connector to build a wire harness for connecting the wing to fuse, replaces several connectors( aileron, flaps, retract) with just one. Use the stock servo connectors on the ends of the extensions from the servo and the Molex connector at the wing center section. Stock connector at the receiver and Molex on the other end of the extension that connects to the wing.