One of these:
Amazon product ASIN B005J43I56
Replaced the bolt that came with the RAM ball, with a M6 allen cap screw (55-60mm) and added enough nuts/washers to keep the ball out of the hole.
Amazon product ASIN B005J43I56
Replaced the bolt that came with the RAM ball, with a M6 allen cap screw (55-60mm) and added enough nuts/washers to keep the ball out of the hole.