Got it sorted last night.
You guys were spot on; it was indeed the very first pulley, it was round the wrong way and the tiny collar on one side of it was enough to make all the difference.
Its this pulley shown in Step 2B that was the culprit.
A massive (MASSIVE) thanks to everyone who helped me.
It was invaluable guys, and it is very much appreciated.
I just couldnt see thw wood for the trees and was getting lost looking for some werid problem, when it was the simplest thing.
IBut I couldnt have reasoned it out without your advice.
Thanks again.
