Opening Philips Sonicare without damaging it

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The basic idea: A suitable machine screw is screwed into the hole on the bottom cover.

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First measure the diameter of the hole, this one here is 5.3 mm.

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Now turn the screw into the hole. It will cut its own thread and it will get quite tight. If it gets too tight, the cover may eventually break, so be careful.

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Then you can pull the cover off by hand with a lot of force and feeling. Good luck!