i will show you my machine and can you tell me if you would trust it and what are his weak point and how can i make it better. I just make it for fun i don't wanna make buisness with it so if you think that will be a flop, just say it, i will make it better next time i'm currently working on the racquet support, the hardest part cause it's directly in contact with the racquet and that can cause damage. pict 1: ( top view of the support) pict 2 : ( side view) pict 3: (under view) not completed yet, it still miss something to sit the racquet on ( i don't wanna scratch it on the metal), i will use cork sheet on the clamp and the aluminium plate. And i need to put a lock under the plate to fix the head lenght adjustment. the weakest point of the system is that there not really side support, only vertical pression to support, do you think it is enough ???