In that case, I would use a large hole saw and cut out the fibre glass from the under side, down to the wood and hopefully this will give you an extra 5 mm.
Is trying to pack it out with 2/ 3 fibre washers a bad idea? I'm going to try a flexi tomorrow to see if that requires less thread than a copper tap connector to bite up.
the woods underneath the fibre glass though like how most base boards are these days so will be hard to recess in to it any ideas? will try the flexi tap connector is there any way of packing this out with another washer?
What you need to do is recess the hole so the tap nut can be tightened further onto the tails of the taps. A router would do the trick, or a large forstner chisel bit.
In that case, I would use a large hole saw and cut out the fibre glass from the under side, down to the wood and hopefully this will give you an extra 5 mm.
You will need to clamp a bit of wood to the topside of the bath to center the holesaw, perhaps with a circular bit of wood just smaller than the existing taphole glued on on and poking down.
If you ever meet the designer of the bath greet him with a knee in the ballcocks.
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