Paul Andrews wrote:

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Thanks guys for the interesting ideas. I'll probably go with the dowel idea
(I like the idea of somethin 'solid' that will fit the hole and can be glued
to the inside of the door.

Then, when you want the job done properly, make a hole large enough to
insert a slip of card or hardboard on a piece of string.

Pull the card tight after liberally coating one face with the
ubiquitous
PVA (actuay a mastic would do better) and fix in position with a stick
or
wedge while it sets.

Then you need filler. Two or three coats.

1/2 hour plus two or three tea-breaks.