“The marble cap makes a huge difference over the original cap/loading tool.
BUT…..if you use it on a tether you have to be extremely careful honestly I don’t recommend using it tethered. My last one broke hanging on the tether. It spun/swung on the tether as I put it down and the straw looking piece on the bottom of the marble cap broke off. And It barely hit the bubbler. Other then that mishap. I highly recommend the marble carb cap.”