Peter

Have a look at this page on the F16 forum:

Blade F16 cascaded downhaul

There are drawings and explanation of how the 8:1 and 12:1 cascaded systems are set up on the blade.

I used to have an 8:1 internal system which I could also make 12:1 but these days I've just gone back to a simple 6:1 setup which gives me all the purchase I need with a lot less rope lying around the place. It may be that I only need 6:1 because I'm using a very flexible mast.