Hi I have a four hose stem on my hookah, I bought it at a local shop so I dont know the brand or anything really, but it is AMAZING! until someone was messing around and somehow got his valve to stay open and he was blowing into it and blowing smoke out of the rest of the hoses, he didnt do anything like take off the valve and mess with it he just did it some how. and ever since then one of the BB's in one of my valves wont close I thoughly cleaned the BB and the removable part of the valve. and it closed like twice but after that it just stopped closing again. Does anyone have any ideas? Thank you!!