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Worn out your Spider Jack clutch already
with a special "V shape" ergonomic structure
Of course Pfanner focused on long-living
double rope rope ascender
- steel construction for improved durability
ART Lockjack Sport with Swivel Carabiners - Steel Locking Worn out your Spider JackThe Lockjack was the first piece of hardware on the market that could totally replace the friction hitches used on climbing lines. Like a Mechanical Prusik, the Lockjack works as both an ascender and as a descender in the doubled rope technique (DdRT). The advantage of the Lockjack is that friction is applied to the rope with a smooth aluminum surface which causes less friction while climbing for an effortless advance, and a smoother more easily