David--thanks for that link. I popped over to bushcraft to have a look, yea! more knots to master!
Graham and I do the same thing, the only difference is that he unclips the ridgeline once he's done, and I leave it on to to hang up my socks and scare away the wildlife
Seriously, the key thing is to tighten the suspension just to the point where the ridgeline just starts
to hold the ends closer together than the suspension would do by itself. At that point it doesn't matter whether the ridgeline is attached or not, you get the sag you would if it were.
BTW thanks for the plug on the bushcraft site. youtube tells me the national origins of the IP addresses that view the videos, so I'll be looking for a spike from the UK!