Purchased a Mya clear Crystal hookah as well as an extra valve and hose to turn it into a 2-hose unit. The extra hose adapter came with a ball bearing of its own. So I have 2 hoses, 2 adapters, and 2 ball bearings. Question: How do I properly use the auto-seal feature to avoid having to hold a finger over the hose when two are smoking from the hookah? Do I put a ball bearing in each hose adapter or just one of them?? Probably should have been able to figure this out on my own, but figured I'd save my brain some thinking and ask the experts.