I have been researching this site all week trying to find info on stringers. I have a fifteen year old son who is interested in stringing his own racquets (2 a month) and a few on the side for some extra spending money. I have come to the conclusion that I want fixed clamps and a 6pt mounting system. I can't seem to figure out if I need a dropweight or a crank. I am considering the Alpha Pioneer DC, out of the box pictures were nice, or the Alpha Revo 4000. I know that we are talking about approximately $150 difference. How much extra am I going to spend on accessories? Remember that a fifteen year old can be lazy. He is very passonate about tennis though. Also, if I go with the Alpha, I know that Mark G. is the one to talk to. I am swayed by the customer service that has been so highly spoke of. Thanks so much for you time.