This was a few months ago but I had a gentleman come out to the house to replace the lock on my front door ( new home!! ). The house was built in '72 but he managed just fine redoing the lock. He also cleaned it, made sure everything was working smoothly and gave me some extra keys. He also told me the keys were a little shorter than normal so if I go to get new keys I should be aware of that. He was fast, professional and courteous. Thanks!