Low Beam Light Switch won't stay in position

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When I'm driving with the light switch selector 1 click over (low beams) it keeps moving and shutting the lights off. When I move it to the 2nd click over (high beams) it will stay in position. It is very annoying having to hold the switch selector when driving to avoid blinding other drivers. Plus I just like things to work correctly! Suggestions on how to fix this? I know that horn rods and switches can be cantankerous. I want to find out suggestions on WHAT TO DO and WHAT NOT TO DO! Any help is appreciated.