Umshini wokuqina we-F series, i-F25 uwumshini owodwa wokuzivocavoca we-Dual station, okungukuthi uqeqesha imisipha ye-Abductor kanye ne-Adductor emshinini owodwa ofanayo. Ithanga Langaphakathi/Langaphandle linendawo yokuqala elula ukuyilungisa kokubili ukuzivocavoca kwangaphakathi nangaphandle kwethanga. Ama-pads ethanga ajikelezayo abekwe ekhoneni ukuze aduduzeke ngesikhathi sokuzivocavoca. Ama-peg ezinyawo ezimbili amukela izinhlobo eziningi zokuzivocavoca. Abazivocavoca bangakwazi ukuhlanganisa isisindo esengeziwe kalula ngokucindezela okulula kwe-lever ukwandisa umthwalo womsebenzi.