Has anyone experienced frame breakage in the shoulder at about 2 o'clock? Today I was stringing a LM Radical OS at 1# over mid-tension, when I heard a faint cracking noise when I pulled tension on the last main. I thought at first it was the grommet barrel at the throat end fighting to overcome my thumb pressure holding it in, but I could find nothing in that area. Later on I noticed the aforementioned crack. This was the second stringing of the frame. The first was factory strung or where bought. The frame arrived having very low tension.