It does catch but once kind of force screwed past it goes on fine. Would say about third turn in it kind of catches and kind of grinds for a couple turns then goes on smooth the rest of the way. I put some ejuice on the threads so it would go on better. Gonna give it a couple weeks and see if it works itself out, otherwise I will send it back. The one I have is very smooth and screws on with no issue.