I often string for friends and generally use Gosen Sheep Micro 17. Recently I was asked to string a couple of cheap (i.e. very stiff) Wallyworld-style rackets (Wilson US Open and Wilson Titanium Impact). I did so, and the guys broke the strings within 10 hours of play. Can someone suggest a good cheap durable reel I should keep on hand for rackets like these? (key word being "durable") Should I just go with a 15ga tournament nylon? Thanks in advance for any advice.