Never seen one exactly like this, and I have a problem with it. It has the usual controls: a "pull lever" which in this case actually a push lever --pushed down when the rack drops; a fan lever, which intercepts the fan and stops the movement; a drum lever with pin that rides on the side of the drum and eventually drops into the hole. When pin drops into hole, fan lever intercepts fan, action stops. Except this one doesn't do that, because the pin never drops into the hole. Because the spring not only draws the drum lever back against the drum, it also pulls it outward sideways, so when the hole comes around, the pin is off to one side, so it cain't go in. The spring does that because the pivot joint isn't tight; it's floppy with lots of play, allowing the lever to be pulled sideways as well as backward. The pivot screw can't be tightened further. It rides in an oval slot that allows the lever to move up and down. For the life of me, I can't figure out what THAT's all about. I see no reason why it shouldn't be an ordinary pivot, like in an civilized music box. It was running OK before. It's not now. I wonder if any of y'all are familiar with this beast, and can make suggestions. Tell me something I don't know.