Ogula makina opangira nsalu a Yongjin omwe amagwiritsa ntchito njira yodzipangira yokha, yopangidwa mwaluso kwambiri, yopangidwa ndi akatswiri opanga nsalu yopanda singano yopangidwa ndi elastic band, tsopano akhoza kufikira opanga, ogulitsa, ogulitsa, ndi ogulitsa odalirika padziko lonse lapansi pongodina batani limodzi. Yongjin yapanga njira yosavuta kwa ogula onse kuti afikire opanga, ogulitsa, ogulitsa, ndi ogulitsa makina oluka, komanso njira yabwino kwambiri yoti opanga, ogulitsa, ogulitsa, ndi ogulitsa afikire makasitomala awo. Ogula tsopano akuwona mndandanda wa opanga, ogulitsa, ogulitsa, ndi ogulitsa mapepala a graphite omwe akupereka mitengo yabwino kwambiri pazinthu zawo kwa makasitomala awo kulikonse padziko lapansi. Timakupatsani mwayi wopeza chilichonse chomwe mukufuna kuchokera ku gwero lodalirika.