Before I left the racket on the machine for any length of time I would use the crank backup. I think as long as you double pull on a crank and it is adjusted properly you will be fine. The amount of time you can leave a racket half strung would depend main on the string you are using and the tension you are pulling. If it was a cheap synthetic I would wait and see when the power came back on. If it is more than 20 minutes or so I would cut it out and start over. If it were gut at high tension I would get out the crank in a couple of minutes.
In reality I doubt anyone could tell the difference if you waited a couple of hours. If it was mine I would not worry about it. If it were a customers I would.
When you're dead you don't know you're dead. It's the same way when you're stupid.
Balance - 31.0 cm, Weight - 358 g, SW - 346 Kgcm^2
Last edited by Irvin : 02-01-2013 at 04:43 AM.