Petzl Pulley Twin Release for Tree Work: 3:1 Mechanical Advantage
21:37
Tree Work Tips: Mechanical Advantage with PETZL Pulleys (V2)!
14:17
Tree Work: Rigging in Trees!
5:33
Building Mechanical Advantage (3:1 or 5:1)
5:08
¿Esta polea cambiará tu forma de trabajar? - Reseña de la Petzl L1D de Bradford Elliot
5:47
Adjustable Bridges Make Tree Climbing Easier - DMM Kinisi Max Saddle at Sherrilltree
12:27
Derribó de Arbol: Aparejo Negativo
4:49
TWIN RELEASE KIT - Petzl's 4:1 Hauling & Lowering System
10:13