Can anyone help with a tap dilemma? I have a bathroom sink with acrylic head taps that need replacing - just the acrylic part. My spindles that the tops sit on are square, and I can only seem the find ridged top spindles. I think they are too calcified to try and change the spindles and there is nothing wrong with the main part of the tap, so don't want to try and change the whole lot. Anyone know where I can get some? Tried Wicks, screwfix, plumb centre, home base, travis Perkins etc.