Ubwino: kuphatikiza mawonekedwe a mkuyu ndi mphamvu ndi kulemera kwamphamvu kwa aluminiyamu. Imapereka yankho lokwera mtengo ndi kusintha kwamphamvu kufooka.

Zoyipa: zitha kukhala ndi mtengo wapamwamba poyerekeza ndi mawaya abwino kapena aluminium. Njira zokwanira zimatha kuwonjezera zovuta komanso kuthekera kwa zolakwika.

Gawo la mapulogalamu: Zoyenera kugwiritsa ntchito mapulogalamu apamwamba kwambiri, makina amagetsi, ndi osinthira komwe kuphatikiza kwa nthaka ndikofunikira.