Mabeyala ozungulira okhala ndi mzere umodzi wokhala ndi khola lokhala ndi mabeyala ozungulira okhala pakati pa mphete yolimba yakunja ndi yamkati. Mabeyala awa ali ndi kulimba kwakukulu, amatha kuthandizira katundu wolemera wa radial ndipo ndi oyenera kuthamanga kwambiri. Mphete zamkati ndi zakunja zitha kuyikidwa padera, zomwe zimapangitsa kuti kukhazikitsa ndi kuchotsa zikhale zosavuta.
Mphete yakunja ya chogwirira cha silinda cha NUP ili ndi nthiti ziwiri zokhazikika, pomwe mphete yamkati ya chogwirira cha silinda ili ndi nthiti imodzi yokhazikika ndi nthiti imodzi yomasuka. Izi zikutanthauza kuti chogwirira cha silinda cha NUP chimatha kupeza shaft mbali zonse ziwiri.
