I always build my own extensions and solder them into the servo leads, by splicing them between the servo and the plug.....no chance of plug problems. I also remember my buddies dad, a lifetime flyer, teaching me that when the Tx and the Rx are too close to each other, the servos will jitter from an overwhelming signal. he always pointed the antenna slightly away from the Rx when testing right next to the plane before a flight,..... then walked away from the plane a dozen or so steps for takeoff,...i'm sure this is the reason he did that.