My dad bought this BR193 Vectron and was having difficulty with it derailing running over a switch. He gave it to me to test on my layout, and I am having the same issue with it catching on the frogs of a switch. I have determined that it's the slider that's causing this issue and I would like to replace the slider. I have no issue obtaining the slider (or package of 6 ) but in the exploded diagram, I don't see a screw or anything like that holding it on. Is it just a pop off and place another slider in its place?