I just repaired electric toothbrush. Again, for the third time (with different toothbrushes in my family, fuck Philips).
After two years of usage rubber button lost sealing. So replace it with screw furniture cap and seal ot with thermal-shrink tube (40/20 mm). Using only home hairdryer.
I feel that it’s a rule for this community: not dull, but not interesting enough for other communites.
And it’s definitely too amature for DIY or Repairing comms.