It pushes down to release the detent which locks the shifter between gears. The OD cutout button has been relocated on my 240s, so I only had to figure out how to retain the locking feature to guard against accidentally knocking the shifter from Reverse into Park.
I originally intended to create a custom shifter head that looked polished and stock, but once I started playing with it and designing the mechanism, I kinda liked the look of the exposed parts. What a friend of mine called a "steampunk" look. I made the actual knob out of a transmission pump gear and walnut. The spring is from the transmission too, I believe. It made sense to me.

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