Answer
Lokacin da aka yi amfani da maɓuɓɓugar ruwan raƙuman ruwa a cikin gidaje da aka yi da wani abu mai laushi kamar aluminum (misali, 6061-T6), abubuwan da aka tattara a cikin raƙuman raƙuman ruwa na iya haifar da 'brinelling' ko shiga cikin gida. Wannan yana ƙara ingantaccen tsayin aiki kuma yana rage preload na bazara a kan lokaci. Don hana wannan, ana sanya wanki mai taurin karfe (yawanci RC 40-45) tsakanin bazara da saman aluminum. Mai wanki yana rarraba kaya akan wani yanki mafi girma. Dole ne a ƙididdige kauri na mai wanki a cikin jimlar lissafin tsayin daka: $H_{total} = H_{spring} + t_{washer}$. A cikin manyan mahalli na motoci masu rawar jiki, wannan daidaitaccen aiki ne don hana asarar tashin hankali mai haifar da lalacewa a cikin masu tayar da bel ko fakitin kama.
