Hi,

I need to replace a few tap heads that have become a bit "tired".
One for a sink and one for a bath. The tap operation (to date) has been
fine. I have had the tap heads off before and they have (what I guess
is) a standard brass (?) rod with vertical grooves (splines?) on to
which the tap head slides and is held by a small screw.

I have taken the screw out of the tap head, but because (I guess)
I live in a hard water area, the tap head has "stuck" on to the brass
pillar. Will WD40 do any good to free the tap head or do I need to hit
the head underneath (it does not matter if the plastic head gets
damaged) with a hammer, or even "split" the tap using a wood chisel?

Thanks

Clive