Post History
Petzl have a diagram on their website for what they call a Double Mariner. It's identified on the site as having a 7:1 mechanical advantage, but I can only see it as having a 5:1. Can somebody con...
Petzl have a diagram on their website for what they call a Double Mariner. It's identified on the site as having a 7:1 mechanical advantage, but I can only see it as having a 5:1. Can somebody con...