Iyo piston mhete ine notch uye haisi denderedzwa mhete mumahara. Chimiro chayo chekunze chakakura kudarika dhayamita yemukati yecylinder. Nokudaro, mushure mokunge yaiswa muhumburumbira pamwe chete nepiston, inogadzira elastic simba uye inonamatira kumadziro ehumburumbira.

Iyo piston mhete inotsikirirwa kumucheto wezasi weiyo groove groove pasi pechiito chekumanikidza gasi, saka gasi inoyerera ichitenderedza kumashure kwemhete uye inowedzera, uye kudzvinyirira kwayo kunodonha. Panguva imwecheteyo, simba rekumanikidza gasi kumusana wemhete kunoita kuti mhete yepistoni iwedzere kunamatira kumadziro ecylinder. Kana gasi rine simba rakadzikiswa rinodonha kubva pakuchekwa kwemhete yegesi yekutanga kuenda kundege yepamusoro yerin'i yechipiri yegesi, rin'i yegesi inotsikirirwa kumucheto wepasi pechipiri chemhete groove. Inoyerera ichitenderedza kumashure kwemhete uye inowedzera zvakare, uye kudzvinyirira kwayo kunowedzera kuderedzwa.

Kana izvi zvikaramba zvichienderera mberi, kudzvanywa uye kuyerera kwegasi rinobuda kubva parin'i yekupedzisira yakadzikira zvakanyanya, saka huwandu hwekubuda kwegasi hushoma. Naizvozvo, "labyrinth" yekuisa chisimbiso mudziyo unoumbwa mashoma egasi zvindori zvine machekwa akadzedzereka anokwana kunyatsosimbisa iyo yakakwirira-kudzvanywa gasi muhumburumbira.