Makhalidwe a mankhwala
1. Vavu ya butterfly ya mpweya wabwino ndi yatsopano komanso yololera mu kapangidwe kake, kamangidwe kake, kopepuka komanso kofulumira pakutsegula ndi kutseka.
2. Valve ya gulugufe ili ndi ubwino wa nthawi yaying'ono yogwiritsira ntchito, ntchito yabwino komanso yopulumutsa ntchito mwanzeru.
3. Kugwiritsa ntchito zipangizo zoyenera kukumana ndi kutentha kosiyanasiyana kwa otsika, apakati ndi apamwamba komanso ofalitsa owononga.
4. Palibe ndodo zolumikizira, ma bolts, etc., ntchito yodalirika, moyo wautali wautumiki, osakhudzidwa ndi kayendetsedwe ka mauthenga.