Re: air valve replace
Wayne, there is a small clip ring in the bottom end of the airvalve, it is kind of like the letter "C" with a small hole at both ends. With small tweezers or a specialized tool, you put the points of the tool or tweezers in the two holes, then squeeze them together and pull them towards you. By contracting the two ends of the "C", you reduce the diameter, which in turn lets you pull them from the groove they normally sit in. Once you have pulled that out, you can remove the rest of the pieces. You can download the exploded drawings from Iwata's website for your particular brush. This will tell you all the pieces you should be seeing or looking for, and it will also give you a guide for reassembling your airvalve.
Good luck, let me know if there is anything I can do to help.
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