In Post #2 I circled the location of the mode switch.
In the center of the switch there are two arrows that point to each other when the unit is in STOP position.
There are other timing marks throughout the mechanism that must be together for the rest of the mechanism to be considered in true 'STOP' position. But, you might first look and see if your mechanism will stop in said STOP position (with the two arrows pointing towards each other) when you press the 'STOP' button.
Let us know and then we'll work from there.
Brian
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