Hi there!
The sloped (angled) part of the red piece must point toward the thumb button. This is the mechanical release for the shifter and does not actually shift the gears.
When you say “constantly on” do you mean the Overdrive button on the side of the shifter? Or the thumb button is always pushed in?
thanks for the reply! The thumb button is always on, I assume the wood knob doesn’t fit the leather one. When I screw it in place the shifter release is constantly on. I’ll try to change the position of it.