1. Wonjezerani malo okhudzidwa ndi kuchepetsa kupanikizika kwa mphamvu yokhazikika pazitsulo kuti muteteze kuwonongeka kwa fastener. 2. Osakanda chomangira pomanga nati.
Chifukwa cha ntchito yomwe ili pamwambapa ya washer wa square, imatha kuteteza bwino kutayikira ndi kutuluka kwamadzi pamapangidwe omanga, kuchita nawo mayamwidwe owopsa ndi kubisa, komanso kumakhala ndi kulimbitsa bwino komanso kusindikiza.
