what is the possibility of creating a tapered ball joint spacer

This was something I considered for a short while, but came to the conclusion that it is probably not very safe. Once you add in a tapered spacer, your fasteners start to get loaded funny, and most likely, it would not hold the ball joint in place very firmly.

You can taper the spacer, but you would have to drill the holes parallel to the face that rests on the a-arm. Then, what do you do about the BJ? The bolts would not be perpendicular to the thickness of the ball joint. This is a bad thing in several ways.

Michael