Any recommendations on where to buy replacement tap knobs/tops for a kitchen mixer tap similar to the one pictured [broken link removed]? The existing ones just screw on/off in case that makes any difference (i.e. the knobs/tops themselves are not part of the tap mechanism). Dublin city centre preferably. The reason for replacement is that the press on caps that hold the hot/cold red/blue colour rings in place have broken and won't stay put. I presume it's not possible to buy just the caps on their own!?