Tuning Magazine "o ring" replacement.

The little black centerpiece that sticks up with the silver ball at the top is supposed to unscrew, normal lefty loosey, righty tighty. It's likely Loc-Tited in. Out of six that I had, I had two that I could not get apart, the others were no problem, and ended up damaging that little black centerpiece (it's made of pot metal or similar). Wrote a letter to FX with pictures and they replaced them, but I still could not get the new ones apart either.

Probably a specialized tool that tightens them at the factory is my guess. You can try emailing them, they answer in a few days normally.

Hope that this helps.

mike