Seen a few posts about how awkward well nuts can be, they're worse when it's cold.
For anyone brave or foolish enough to be fidddling with screens in these temperatures, a tip for getting the "well nuts" out of their holes if you're raising or lowering the mount position.
They are just Rawlnuts, essentially a rubber tube with a thin flange at one end and a brass nut held at the other. If you can't get them out by pulling, they'll be "dog-knotted" as my mate colourfully describes it, I.e. bunched up behind the plastic and too big to get out. Stick a length of strimmer wire or fishing line through the hole, waggle it till it appears at the bottom of the fairing, and push the well nut inwards. It'll follow the strimmer wire / fishing line and not take up residence in the deepest recesses of your plastics (down the side of the radiator, often as not). Then pop it in a cup of boiling water and watch it pop out to its normal extended shape and size, ready to be re-inserted into the orifice of your choosing. (ooer)
Simples.