This video is an example of a shuffler missing the magnet on the kicker.
The below screenshot is taken from the pax illustrated parts guide, it represents the Kicker/Insert Arm and the components that make up it’s assembly.
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If all of these things check out as normal the next step would be to verify the magnet (Part #9 in the diagram below) is actually still in place inside the disc (Part #2 in the diagram below)
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the example below is a motor WITHOUT the magnet.