Steering Column inward outward play and square nut installation

1st step- you say that the coupler was damaged. Are you talking about the coupler at the box? Is the shaft itself damaged? Pics would help. Also, pics of the top of the column, two square holes in the tube, is there damage there? When we understand the extent of the damage, we will know how to proceed.
Thank you for the response, I'll take current pics as I dive into it again this coming week. I was referring to the couple where the column joins the gearbox. Though rebuilding the coupler is not an issue, rather that the damage to the coupler being forcibly opened due to the play (inward/outward movement) with the steering wheel.