Isikrufu sethu seseti senziwe ngentsimbi ye-alloy ephezulu, echanekileyo ngoomatshini kunye nobushushu obuphathwayo ukuze kuqinisekiswe ukuqina okugqwesileyo kunye nokuthembeka. Intloko ye-Allen yenzelwe ukufakwa lula kunye nokususwa, kwaye inokusebenza ngokulula nge-wrench ye-Allen.
Akukhona nje ukuba i-screw esetyenzisiweyo iphelisa imfuno yokugaya kwangaphambili okanye i-threading ngexesha lofakelo, kodwa inokulungiswa ngokulula kwi-shaft ngokusebenzisa umlinganiselo ochanekileyo woxinzelelo ekusebenziseni ngokwenene, ukuqinisekisa uxhulumaniso oluqinileyo kunye noluzinzile.