For $120 plus shipping I'd like to just make what I have work. I've got lots of extra stock adjusters maybe lay one on its side on an anvil and smash the threads with a hammer a little bit..?..
Take the rockers and put them on your anvil on the bottom corner and gently tap the opposite bottom corner with a hammer. You only want to close the bottom side of the holes just a very small amount. That'll do it.