thermostat knob tore off

my boyfriend took part of the back off unscrewed a few screws took the old one out and put the new one in. It seemed simple to me I was surprised. I knew the cost would have been more than double the part if I had called an appliance technician to do it. I received the part the next day which I was tatally suprised since it was a Saturday. I am very satisfied with Parts Select inventory and service Thank You