On 13/03/2019 18:38, R D S wrote:
I'm relocating it and could do with taking it down by an inch at each side.

As it happens it's a good job the door casing didn't fit after i'd cut
it to suit the door (or thought).
Because i'd made the whole aperture 30 inch, instead of the rebated part
that the door sits in.

Thick as ####.