73 steering shaft to short

When I had this issue, I removed the coupler, loosened the column and used a pair of vise grips on the protected column to tap it out. Then I put the coupler back together and assembled the column. You can use a wrench on the dowel on the end of the shaft but is risky as you don't want it damaged. If you hit the back of the coupler you will likely not go deep enough with the shaft once the coupler is engaged on the gear. You need to have the coupler internal parts all the way in.