AD headlight switch

[yoshi]

I purchased a non o/e headlight switch, my lights suddenly went off so I turned the knob a little & it came back on. Now the lights keep going off even flickering. It's a bit dangerous desperately fiddling with the switch trying to get the lights back on when they go out. Anyone else had this problem? I see the genuine ones don't have a knob fo you have to buy them seperately? Any recommendations where to get 1 from? Thanks