This is a capstan for a stringbender for an acoustic guitar. When actuated, the String Wheel turns about 15-18 degrees. It does NOT spin, but simply turns, then is pulled back to "zero" when released.
My problem is that when I tighten the nut (bottom) the entire shaft binds and sticks. I assume that the 2 washers in the center are the problem, but am not sure how else to assemble it. Without those washers, the entire bearing rubs against the surface of the Housing and sticks. The small washers are the diameter of the bearing's center shaft, and so I thought they would release it from sticking to the Housing.
It's a simple setup (I want to keep it that way), but I would like to be able to tighten the shaft properly. I've attached sketches of the parts, and a photo of a finished piece on a guitar. Thanks.