So I've been stringing my own rackets and I'm using Kirschbaum spikey 17gauge and gosen og sheep 17 and I'm breaking strings everyweek and its always the poly mains. Normally in the same spot just below the middle and side of the string bed. Not at the grommet. Then I got pissed yesturday because it was my backup racket and it was the 2nd set of strings I popped that day so I took my racket and hit the string bed on the net post and another string broke. I'm stringing on a Mutual Power Hercules 610 dropweight so I'm not sure if the calibration is off or what. Also right before I started stringing I switched to the POG mid from the n6.1 tour.