On Thursday, 12 March 2020 15:07:28 UTC, wrote:
Is my memory playing tricks or did one vintage of this manual show you how
cover a panelled interior door with plywood (or quite possibly hardboard),
while a later vintage told you how to restore a door that had had such
an atrocity perpetrated on it?

I think it was the DIY magazines that went wild with abandon telling you how to build your own bedroom furniture out of asbestos sheeting, etc.

Hardboarding interior doors probably saved thousands from the skip in the 60s and 70s

Owain