For anyone with an Iwata Revolution airbrush or an airbrush that has similar parts...I have the Iwata Revolution CR. What is the part that I believe is called the "Spring Guide" for? It's the part that screws in over the needle spring. I know that it holds the needle spring in place. However, should it always be snugged down or is it meant to be adjustable. If it's adjustable, I notice that if I loosen it, the trigger just doesn't have as much spring back. Maybe it's meant to be snugged down all the time.??? This is what I get for taking my airbrush apart. Now I can't remember if it was tightened up or not and if it's supposed to stay that way. The booklet that came with it doesn't give a good description of what the parts all do, what's adjustable and what's not, etc.

Thanks for your help!