
Just keep spinning the T-handle clockwise, pop the screw in and try it,
takes a few tries to get it set right, too far on and it will not stay in park

and not far enough it will not go into 1st.
When you push the side button it pushes the center rod in the lever down
and that operates the pin in the notched metal gizmo, ultimately this is what
keeps the Trucklet in the various gears, or keeps it stuck in park.
Good work getting home

Wild