> I've seen on Toyotas and also at Universal Studios bolts on rides are marked with paint presumably to indicate that the nut hasn't backed out. This is also s

> I've seen on Toyotas and also at Universal Studios bolts on rides are marked with paint presumably to indicate that the nut hasn't backed out. This is also standard procedure for electrical maintenance inside distribution equipment. Every lug/termination is torqued to spec and then marked to indicate it has been torqued down. This should be done regularly to prevent any loose terminations from causing an arc flash.