I saw a Prince EXO3 Graphite 100 Mid+ in the "Sale Price" bin at the club today. Its the emerald green stick with open rectangular grommets along the 3 and 9, and regular grommets at the 6 (and I think at the 12?). I was wondering if there is any issues or problems stringing the open rectangular "holes", or just string 'em up like normal? (I thought I read somewhere that some of the other Prince "O port" racquets needed a specific tool or guide or something to string them.) I have a simple Klippermate drop weight stringer, and have never strung a racquet that didn't have normal grommets all the way around.