wet the strap. Don't just dip it like a little tea bag. lay the bc in the water for a few seconds. put the tank on, tighten the band and flip the cam over about 90% with your thumb in there to keep it from going all the way. hold it for a few seconds. slowly release it while holding the tail tight. when it's all the way open cinch up the slack thread the tail through and close. As was said it should thud or snap. if not, open it up again and repeat the last step. This is what we teach every one of our open water students. Can't say what happened before I started helping out but roughly 40 or so students and hundreds of dives later we've never had a report of a tank slipping no matter what bc or tank was used. Have seen alot of them though from other classes that use the same locale we do. I realize now how fortunate I am to have the instructor that I do. So many of these little BASIC problems I've not had to deal with because of how I was taught. That said I am thinking of getting the Apollo lock just because I may have to have rotator cuff surgery and may not be able to pull the band tight enough for awhile. But you can bet that I'll still wet that strap first.
