No need to cut, solder or anything like that. Just buy 6" extensions for your particular type of system (J,Z, old airtronics, etc.) That should give you plenty of length to reach the "Y" harness inside the fuse. IF you need it, they do make them in longer lengths as well. Another option is to purchase some aftermarket servos (HiTec). They have MUCH longer leads on them that standard (futaba, airtronics, etc) servos have.

On my Sig SE, I put two HiTec servos in the wings, and the leads were long enough to make it all the way through the wing into the fuselage.