So I was stringing my girlfriend's racquet the other day. She has the Prince O3 Speedport Tour with the speedport grommets. I checked for any cracked grommets and there were none and everything checked out fine. I was stringing it on my drop weight Klippermate machine and after the first three strings, the throat grommet with the string holes just cracked. The string cut right through the string holes. I strung it at 60 lbs which is in itsrecommended tension range. So I ordered two sets of grommets from TW, replaced them and went to string it again. Same thing happened to throat grommet so I just used the other throat grommet in the other set. I just wanted to know, has anyone else had this problem? Is there a way to avoid doing it? Some specific stringing technique for it or something?