Fixing a Sonicare HX9160 that got loud and loose - tighten the screw!

This screw loosens over time on different models of this toothbrush. You either put up with the noise and vibration, throw it away, or tighten it. When I tried it afterward it was clearly better.

[@TimSaundersC4]

Thank you for the video!

[@DrumberBoy69]

Thanks for the video! Do you know what size screw this is? I lost mine and need to buy a new one.