Mazda2 2013 4door Automatic Transmission Gear Shift Knob Question/Problem

Mazda 2
Recently the gear shift knob/gear shifter has come loose on my Mazda 2 Automatic Transmission.

When shifted into a gear the whole assembly seems loose, twists and can move up/down more than it used to.

Does anyone know how this assembly comes apart so I can diagnose the problem,.. or know how to tighten it back down?

The gear shift knob has a button on the side that when pushed in,... allows you to change from park to drive, etc. and also has the overdrive on/off button below.

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