Measure twice, cut once right...

Upgrade project in South Africa. Asked the lads to make a small hole for 6 cables. Short coffee break later, gaping hole. Factory is incredibly dusty. Cabinets need to be airtight. The lads spent the next 2 days cutting and welding. (work goes slow in SA). Next time I'll draw the cut mark on the cabinet. What should have been a 30 minutes job turned into 2 days.