Yes, you are up the creek by removing the eccentric screw.
The return spring for the drum actuator has two long ends which are supposed to hug that screw shaft.
You can't just reinstall the screw and land in the middle of the spring arms because the spring arms will close up.
The picture is from a different gearbox but yours works the same.
The round head is the screw being squeezed by the spring arms.
The only way to get a paddle now is to open the gearbox.
The return spring for the drum actuator has two long ends which are supposed to hug that screw shaft.
You can't just reinstall the screw and land in the middle of the spring arms because the spring arms will close up.
The picture is from a different gearbox but yours works the same.
The round head is the screw being squeezed by the spring arms.
The only way to get a paddle now is to open the gearbox.