Pitbull, the old saying never changes you get what you pay for! My trackbike fell off the cycle gear black stands last season in the pit at NYST. The lower pit area is an awkward sloped pit. I also run woodcraft swing arm spool sliders. I put the 10mm ones on my wife's RC390. Her bike is going to become a trackbike this upcoming season. Reason? I low sided my trackbike with vortex swing arm spools. The left side bent upward. I was very lucky I was able to back out the screw and fit the woodcraft slider spools, with a little crooked look! If that spool pushed up any further the swing arm would have to be replaced. It's a thought.