I've got a BBQ Grillware grill (Lowes).

The side burner can't be used for much other than boiling water
because it can not be turned down low enough.

While there is some degree of control via the valve, the flame ranges
from really, really high to just really high.

The regulator must be working because the 3 burners can all be set
from very low to a normal high.

Is there something after the regulator that can be adjusted to reduce
the amount of gas going to the side burner?

(It's not a new grill, so I can't return it.)