I had mention it before but maybe its forgotten. If you dont want to take primary inhales with CR closed and without pushing the button to bring liquid inside atomizer in case of a burn taste, you can also leave CR open and blow air through the mouthpiece. It has the same effect so if its more comfortable for you do it that way.
About button. Dont screw hard the locking nut to lock the button. Issues of unscrewed buttons are because some people lock it hard. The answer is NO. Button will lock if you screw the locking nut until it reach the head of the button. Dont press it more, no reason for that.
Simple advices for serious vapers