Does anyone see anything obvious missing here, like a spring? It's acting like it's missing one: when it tries to add a credit it catches a bit, but skips, and rather than decrementing one at a time, it just releases and goes back to 0. Everything moves smoothly, and I've tried to compare it to another I have, but I haven't yanked that one for a good look. Somebody did mess with it at some point, because the spring was on the wrong side of one of the pins.

IMG_1028[1] (resized).JPG

@MarkG-The spring is the only thing that keeps the cog in place? There is about about a half inch of movement in and out on the shaft. When out just a bit it does not engage, and when in place it skips/goes back to 0. Do you know of an exploded view of this stepper anywhere?

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I have been, but hoped to avoid pulling them completely and removing the cog.

That part is good. Do you have the rest of the illustration?

Thanks! Is that catalog available online?

Hokay, after staring at that gd unit forever, I finally figured out that the cog and arm was moving enough so that the notched piece in post 5 was not catching. With the wheel on and cranked down it doesn't move. Thanks all!!