Pali mitundu ingapo ya zinthu za shaft, kuphatikiza zowongoka, cylindrical, spiral, convex, concave shafts. Maonekedwe awo ndi kukula kwake zimadalira ntchito yeniyeni ndi ntchito yomwe mukufuna. Zogulitsa za shaft nthawi zambiri zimapangidwa mwatsatanetsatane kuti zitsimikizire kusalala kwa pamwamba komanso kulondola kwake, zomwe zimawalola kuti azigwira ntchito mokhazikika pa liwiro lalikulu kapena ponyamula katundu wambiri.