APEX Needle Tube & Rocker Assembly (Replacement Part)

I bought my Apex a while back but I haven’t used it a lot. Contrary to what UMP recommend, I like to strip my airbrushes down to give them a thorough cleaning. I’ve noticed while cleaning the needle seems to be catching on something when I put it back in. It’s not the needle seating bush so it can only be at the back of the airbrush. Which is why I bought this needle tube & rocker. Now I’ve changed it, the needle slides in much smoother, just as it should. Very pleased my airbrush is working properly now.