I’ve had my Stereo 160 for 2 years now and had zero problems with my shock bolt. I did read about this problem before I purchased it but I just put snapping a shock bolt down to bad luck or ham fisted repairs. My mate bought a second hand Stereo which was about 5 years old, we stripped it down and he managed to shear his shock bolt off but on closer inspection you could see the stress cracks in the alloy and it looked like the Hulk had tightened it previously.