So I the threads in one of my YORKS are no good so I used a helicoil kit to fix them. But when I went to screw the bolts in they just pulled the coil out. I can't figure out if I did something wrong or what. It does hold but not very well. I always thought helicoils were suposed to hold real well. Maybe not. Anyone know if this is normal or if perhaps I have done something wrong?