Can I use just the 21in Y-harness with no other extensions? I figure fewer connectors have a better chance of not coming apart.

Then again, im gonna get a Futaba 7C 2.4 ghz radio, so i can use two channels. hmmm Now im wondering what length extensions will work with this setup. I guess if 6" extensions and 6" Y-harness work, then a 12" extension for each servo with work. Is this safe to assume?