If you have a torch with a small tip you can aneal it and then drill or whatever. You might end up repainting it. An easy out might work depending on the direction you need to go if you just looking to get the ball end out. I have taken a tap and ground the threads off with an angle to grab in the direction I need to go for special jobs. Do not heat it or it will loose the temper. Grind and cool grind and cool.