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A very very qualitative machine would be the GAMMA X-6 FC - Pro.It costs about 550€, but it is extremely good. This one is manual, but it has so much advantages, that it is quick and costs less effort. If you want an automatic machine, then the PENTA PREMIUM STRINGER is what you would need to buy. It costs a lot, but you can string others racquets as well. If you have any further questions, I am glad to help you out.
How to String Your Tennis R...View Instructable »