Introduction
This guide will help you replace the spring in your Philips Sonicare FlexCare toothbrush.
Tools
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            Push the flat edge of a nylon or metal spudger between the seal and the toothbrush body and pry it up. Do this on each side until the seal is partially sticking out on all sides. 
 
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            Apply pressure to the shaft by pressing it against a firm and flat surface. Continue to apply pressure until the interior electronics are exposed. 
 
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            Pull off the black rubber ring with a metal or nylon spudger until it clears the metal piece that holds it in place. Pull the ring out. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.