get very 'difficult to move' making the
screen difficult to fold up and down.

We have have tried 'WD-40', but that seems effective for only a very
short time.

And is bad for the plastic.

We are afraid to use ordinary oil as we thought it might effect the
plastic.

So does WD-40.


WD40 is nasty stuff with most plastics. It seems to get inside the plastic
and
it disintegrates suddenly and catastrophically at a later date.


Radio Spares part number 175-5880 Special plastics grease

Hope that helps John.