I recently wanted to explore whether shortening my WBBB ridgeline would improve my comfort. I thought about making another whoopie sling for this (which I find is fun in itself), but then hit upon a quicker and easier solution. I simply wrapped the existing ridgeline around a carabiner to shorten it. The line makes a spiral around the biner which doesn't really stress either the ridgeline or the carabiner, and the spiral can't unwrap because the carabiner is closed. For my big carabiner in the photo, each wrap around the carabiner shortens the ridgeline by an inch or so. If you use a smaller carabiner, like the 1100-lb rated one that Warbonnet sells with the BB, each wrap equates to roughly half an inch of ridgeline length. You'll have to do your own measurements for whatever carabiner you might have, but you get the idea. Once you find the ideal ridgeline length, you can then replace the original ridgeline with a new shorter one. Of course, this won't work if you want to explore a longer ridgeline than you already have, but you could start by switching to a longer ridgeline first, and then shortening it with the carabiner trick to find the right length for you.
In hindsight it seems like an obvious solution to creating an adjustable ridgeline, but despite some searching, I haven't seen any other references to it in the forums (maybe somebody else can find it). Anyway, this technique has worked great for me -- hope it helps somebody else!
Note: most people use an adjustable ridgeline temporarily -- to find the best length and then replace the ridgeline with a new fixed length. If you really want an adjustable ridgeline all the time, a whoopie sling would probably weigh less.
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