Hey there Supergirl,
My dh/ds's barber does this for his razors and blades. There is an older gentlemen in Raleigh that does this but sadly he is basically the only one in the area. You can really tell a difference when their hair is cut with dull clippers(their old barbers) versues Tyrone(the new barber). Their cuts are so clean and neat(my little one looks like a businessman with his cut....so sweet).