Njengoba kunezakhiwo ezimbili ze-bore cylindrical noma tapered kanye nezigcina ezenziwe ngeshidi lensimbi noma ama-resin okwenziwa, ama-bearings ayisici semigwaqo yawo yangaphandle yendandatho eyakhiwe ngendlela eyindilinga evumela ukungahambisani ngaphakathi kokuphambuka okungu-3° phakathi kwendandatho yangaphakathi nendandatho yangaphandle, ukuze kulungiswe amaphutha okugxila kanye nokuphambuka.
