1. Likely to be M4, M5 or M6
2. Use the shank of a drill bit inserted into the hole to get an approximate size.
3. Then if:
3a. 3.4 mm drill fits - M4
3b. 4.3 mm drill fits - M5
3c. 5.2 mm drill fits - M6
There's a black screw under the flush buttons that holds them in place.
My plumber has lost it, does anybody know the thread size and length so I can get a new screw instead of buying the full buttons and everything else?
Thanks.
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