I have been playing drums 10 years. One problem is my hi hat. How can I fix it so it stands balanced. Like the top cymbal will lean to one side and uneven. Kind of bugs me when I try to keep time opening and closing it.
There's your answer, that thumbscrew will do the trick. It's fun to experiment with the spectrum of flat to very tilter. You might be suprized the way it sounds if you track a song enough times with adjusting that angle of the bottom hat (assuming you're playing the same thing over and over).Aside from checking the rod and felts, your stand may have a small thumbscrew under the bottom hat. They are there to allow for adjustment of the angle of the bottom hat, which could be the culprit if you don't find anything abnormal about the other aspects.
I find a slight angle on the bottom hat beneficial in that it helps prevent the air-lock phenomenon, and allows for a stronger "chick" sound when closing them with the foot.