Sobanura intambwe zo gushiraho impeta 3-izenguruka impeta yimbere imbere ukoresheje 'Plunger na Sleeve'.

Kubintu byimbitse byimbere, kwishyiriraho intoki ntibishoboka. Igikoresho 'Sleeve na Plunger' gikoreshwa. Ubwa mbere, impeta ya spiral iranyeganyezwa mu ntoki. Uruhande rwimbere rwikiganza rufite ubunini buhuye na diameter y'imbere. Punger noneho asunika impeta ifunitse binyuze mumaboko kugeza igeze kuri ruhago. Kuri iyi ngingo, ingufu zabitswe imbere zitera 'gufata' gufungura muri ruhago. Ku mpeta-3, isura ya plunger igomba kuba yuzuye neza kugirango wirinde 'inkoko'. Ni ngombwa ko amaboko akomera kandi agasukurwa kugirango agabanye ubushyamirane; bitabaye ibyo, impeta irashobora 'gukubita' ku ntoki cyangwa impinduka zishobora guhuzagurika, bigatuma impeta ihinduka mbere yuko igera kuri ruhago.