On Sun, 29 Nov 2009 14:37:47 +0000, Appelation Controlee
wrote:

snipped

Or try a strip of very coarse sandpaper fed under the door and rubbed
backwards and forwards ...I did this once and used a piece of floor
sanding stuff that had been left behind .

Thanks for the suggestions - I already tried sandpaper, but much to-ing and
fro-ing resulted in little change. The timber strip is quite subsantial,
and it's unlikely it could be removed without destroying it. It's as much
part of the door as the mouldings surrounding the panels.
I'll try the hacksaw blade and let you know.

I found you had to do it in a specific way for it to work .The
sandpaper has to be long enough for you to have a good grip on it so
you can exert an upwards force with one hand on each side of the door
..and using a "one side up/other side down" motion ...as I said the
stuff I used was part of a floor sanding belt which has a fabric
backing and doesn't tear .....I think I also tried a blade but found
the trouble with that was it kept bending away from the undersurface
of the door .

Another alternative is a device specifically made for cutting slices
off bottoms of doors in-situ ...cant remember what they are called .