Hi Riff Raff,

You can make a plastic barrier from a cola bottle very easily...........to answer your query about
super versions, it could be that you have just exceptionally noisy GB's that interfere with your
radio signal....mechanical noise from gear systems at the right frequency can cause radio problems...............different xtals might give you a better result........and bedding the gearbox in will help too........just connect the motor up to a battery pack or other power source and let it run
continuously for as long as you can........using rocol grease or other gear bedding medium on the gears will also give a better result...............

Good luck

CaptB