Ya so you can bill twice! Once to do it the way the customer wants and a second time to do it right once they realize their mistake.
MECHANIC
HOURLY RATE
$100/HR ==== STANDARD
$150/HR ==== IF YOU WATCH
$175/HR ==== IF YOU HELP
$200/HR ==== IF YOU WORKED ON IT FIRST
$250/HR ==== IF YOU TELL ME HOW TO DO MY JOB
MECHANIC
HOURLY RATE
$100/HR ==== STANDARD
$150/HR ==== IF YOU WATCH
$175/HR ==== IF YOU HELP
$200/HR ==== IF YOU WORKED ON IT FIRST
$250/HR ==== IF YOU TELL ME HOW TO DO MY JOB