Well im changing out the upper balljoints on my car (66 mustang). Well on the upper control arm there are four RIVETS holding the ball joint "plate" or whatever you want to call it to the upper control arm. How the **** do I break them? It says in the manual to use a chisel. Yeah freakin right. I got the heads off of 2 of them with a grinder. The other 2 are not accesible with a large tool. Need some ideas.