I have a bagless vac. It's pretty average, I guess. The last time I tried to use it I realized it wasn't picking up much. I tried to make sure the canister, that seethrough part in front, was on tight, but it might be loose. Does that have anything to do with it? If it does, how do I fix it? If that isn't it, how do I find out what else and fix that? Also, how do I get a replacement clean water tank for a Bissell readyclean powerbrush? The old one broke when it was finally pried loose and went flying. Is there a way to make it fit looser but still tight enough?