That's a good question. I have some that stay and some that want to move. I may have to work on that. If you add some friction or tie it to something like a light switch to lock it in position, it should stay very nicely.
I visited a guy's layout once, and he used a dowel as a push rod, which he tied to a toggle switch. He was in HO, and used the electrical contacts of the switch, for power routing. We don't need that aspect, we just want something to have that positive click. To connect it to the linkage, he drilled a hole in the plastic paddle.
