a quick question if i may - i have bought a basin mate (as advised on this site) from b & q - called a vanity/basin washer! when putting it up to the bottom of the basin, do i use any putty around the top as i would for a normal washer, and also the plastic coating on the outside (like a small/thin backnut) - do i throw this away and use my original backnut instead? sorry i have never used one before and they are funny little things!
thanks guys!
