Switch guard for portable inflating pump

I bought this great Alps inflatable bed for camping and for guest use. The problem is that the switch comes on too easily if something bumps into it during transport. Then you arrive at your destination with dead batteries in your pump or a burned out pump. I created this ring to lock onto the pump and prevent the switch from turning off. It has a button that holds firmly in the power port to keep the ring in place. Then it covers half the switch to make it impossible to turn on until you remove the ring.