Kuzunguka chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma chuma
Mechanical nguvu winding, katika spiral, kuna aina tatu tofauti ya vipande: 3.2mm "R", 4.2mm "M", 6.5mm "T".
R kipande, kipande kidogo na eneo kubwa la joto, na joto kubwa;
M mpango, mpango mkubwa, joto na upinzani wa hewa ni ndogo;
T-chip, inafaa kwa hali ya shinikizo la juu la mvuke na ongezeko la joto la hewa la chini.