I have a 67 vert that is nearly done except for the top. I installed the frame to line it up prior to having a top installed and have an issue. The frame binds at about the half way point going up and down and then the driver joint kind of pops and the frame continues moving. When it pops the whole thing shifts. I cant see anything bent. Has anyone had this type of problem, I was thinking of buying the bushing replacement kit but I am not sure if it will help or not? Any help would be appreciated.