Hi I have a new martin ooo koa. martin recommends special lights they have an 11 on the e string. I went through ten packs today trying to string the guitar. every time I tighten the High e string the ball unravelled or popped off inside the guitar.Th pin staying in place. Finally gave up and switched out the e string with a different brand 12 gauge and it worked. Are the strings defective? The brand is Martin acoustic SP custom light.