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I made this Shoulder Pulley in 1978.
My Shoulder Pulley is 108 mm. long, 51 mm. wide, 72 mm. high, and weighs 197 g.
Before Ron Simmons developed and offered his Simmons Roller, most Gibbs users, including me, relied on a shoulder Gibbs to keep upright. Although it has almost disappeared, that system worked quite well and had some advantages over the chest roller. To eliminate drag on the shoulder ascender, some of us added rollers to ours. I went one step farther, and made this shoulder pulley for use in the 1978 NSS Convention vertical contest. The sheave is from a roller-bearing model Russ Anderson pulley, the bolts came from a hardware stpre, and the remaining parts I made by hand.
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