Hi everyone, I am a proud Shocker owner but have a few questions. Does anyone know what the "semi" pot switch on the 4x4 shocker does? I got one of the newer models and it came with a black bolt, i read someone bought a delrin bolt and it too was black, so are all shocker bolts black? Also, I've adjusted the "fire" pot switch but i still have blowback, what else can i do?