1/2 the cjs I have owned ,solved the play with that worm gear
adjustment on top of stearing gear box. When adjusting hold
screw with screwdriver an release lock nut, hold lock nut an
turn screw in a little at a time while someone works steering
wheel back an fourth till tires react to steering wheel, a little
goes a long ways here, be sure an hold screw an secure
lock nut tight. If steering fills like it has sand in gears when
turning backoff adjustment a little.