RE: JR Radio, non JR (Futaba) Connectors
As K_caller said, you may have to make the little bevel on the Futaba plugs (newer Futaba plugs have the bevel) These bevels are only needed when plugging a Futaba servo plug into a female connector, as on an extension or charge jack. Servo plugs without the bevel will fit any receiver perfectly just by trimming the tab off[)] bevel not required[8D]
Pete