I have a theoretically 'new' tap installed by a licensed plumber at a huge cost. I want nothing more to do with this guy. It is a noisy tap and wish to use tap silicone after I dismantle
kitchen mixer
spanner rquired for this nut
all the tap parts (I've replaced the aerator) However I can't undo the nut inside the mixer housing where you remove the red and blue plastic plug. It's not a grub screw it has an internal thread so needs a special socket spanner...less than a deep drive 6mm which doesn't fit through the hole which is 6.5mm. What type of socket spanner is used please?