i made a bracket that fits under the coup holder , used a piece of solder wire to get the shape and then used some 1/8''x3/4'' steel flat stock .
Drilled and tapped 1/4-20 as seen here
then drilled clearance holes throughout the bottom of the arm rest and the coup holder , then i marked the flat stock and drilled and tapped 1/4-20 , used a little blue locktite on the bolts and the side to side wobble is at a minimum , there still is a little but i can live with it