Richard,
As one of the first, I had only one previous experience on a locost a month before mine. --same screen !!
I filled the awning rail with a piece of spare wire. It happened to have ther right diameter and was just lying around the garage. With the awning rail too long I started the bend on the screen (about 1 foot extra on the end) this got it most of the way there. I was then able to fettle the rest of the bend on varoius diameters from house and home - (saucepan, can of beans etc). I had made marks as I went as to which bit bent initially and which I had to finish.
Reversing the marking procedure ended up with a tight fit to the top of the screen and some legs down the side to trim off.
The Surrey edge has a peice of coaxial cable in, it slide easily from one side across the whole width. Pop studs on the ends to fix to the screen pillars.
The locost rail is screwed on in 5 places, this means holes drilled through the rail and nicks out of the smooth edge the surrey runs in. The locost doensnt leak just the ends of the feeder pop out these gaps when fitting.
My 2B rail is only bonded on ( Tigerseal ) and has never given any indication of coming adrift. I can really heave on it ..
Graham