Ball joint neck for old school pivot neck?

Yeah I've actually just added a ball joint to an old house of the dead figure, here's how I did it. Take any ball joint (I used the ankle off a Jakks wrestler), Cut the surrounding area down to the size you want it. Take your figure you're attaching it to and sand out a hole from the neck big enough to fit your ball joint in, go slow and test fit often. Glue the ball in with superglue then fill in gaps with sculpt. I'll try to get a pic for you when I get time but hope this helps for now.