Kubwezeretseka sikukugulitsidwa palimodzi ngati waya, ndipo ndi mtundu wa zomangamanga.
Kapangidwe ka coil ndi mtundu wobwezeretsa, koma pali kusiyana pakati pa awiriwa. Mwachitsanzo, pali zosiyana mu mawonekedwe a ziwirizi, zobwezeretsedwazo ndizozungulira, ndipo zonunkhira nthawi zambiri zimakhala disc. Pali kusiyana pakati pa awiriwo, kubwezeretsako ndi kotchinga, m'mimba mwake muli pafupifupi 10 mpaka 34 mm, ndipo kutalika kwake nthawi zambiri ndi mita kapena 12 metres. Dongosolo la chipilala cha coil nthawi zambiri limaposa 10 mm, ndipo chitha kukhala chosawerengeka.
Zolemba ndi zosiyana. Mulingo wamtundu wa coul screw ndi 6.5mm ,,0mm, 10mm, 12mm, ndi 14mm, pomwe 9mm, ngakhale 9mm.
Ndalama nkhono zomwe zimagwiritsidwa ntchito monga zomangira.
