the gear on the accel pot is on backwards, and has a spot with no teeth that it can twist to that spot, and then it just stays there.
Rotate the gear so that the open spot on the teeth does not come up.
There is only 2 ways the gear can be installed, and you found the other way first.
It almost seems like we are related. In my family, if there is only 2 ways to do something, and 1 is wrong, we try the wrong way first, pulling on the door that says push, etc...