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Petzl Simple descender upper bobbin
SKU: D03101 OverviewPetzl Simple descender upper bobbin
Spare part for Simple descender. User replaceable with two spanners. Worth taking on an expedition. A nut and bolt may also be useful if the bobbin is changed too late, and the thread of the bolt already in place becomes partially stripped.
See: "Tecnical information" for replacing the wheel on the Petzl site.