I"m using a tub which has been there for a while, but it has not been used for over a year or 2. My fear is that the original plumber may not have put the filler together correctly. I'm trying to figure out what may be doing on . I took a picture of the actual filler. On the right side there is a cylindrical fitting that seems to slide 1/4inch up and down, but doesn't seem to divert the water to the tub filler. The water only stays on the wand, and the metal fitting will not stay on the up setting. Any thoughts on how this mechanism works, or what to look at?