Originally Posted by Irvin
^^That's a couple more reasons that lead me to believe the standards slipped. Did you measure the rackets?
I'm guessing you mean the place where the racket is mounted , but I don't think the OP left the racket mounted. It sounded to me like he did the mains on all 3 and did not leave any actually mounted to the machine.
As people have said, you should finish a full string job at once. If some emergency comes up as you finish your mains, at the very least don't take the racket off the machine because the machine is helping to support your racket until you get the crosses strung.