Answer
Za'a iya 'take maɓuɓɓugan igiyar ruwa' don gyara aikin tsarin. Yin tarawa a cikin 'Series' (crest-to-crest) yana ƙara juriyar juyawa yayin da ake ci gaba da ɗaukar nauyi ($ k_{total} = \ frac{k}{n}$). Ana amfani da wannan lokacin da ake buƙatar babban bugun jini a cikin ƙaramin sarari na radial. Stacking a cikin 'Parallel' (nasted) yana ƙara ƙarfin lodi yayin da ake kiyaye juzu'i ($k_{total} = k \cdot n$). Don jerin tarawa, raƙuman ruwa dole ne su kasance masu daidaitawa-zuwa-kwarkwata; wannan yana da kyau a samu ta amfani da maɓuɓɓugar ruwa mai juyawa-zuwa-crest maimakon zoben ɗaiɗai don hana rashin daidaituwa. Don tarawa iri ɗaya, dole ne a gina maɓuɓɓugan ruwa daidai. A cikin duka biyun, jagorori (shafts ko bores) sun zama tilas don hana tari daga 'buckling' a ƙarƙashin kaya, kwatankwacin yadda dogon ginshiƙi ke murƙushewa.
