Already miss the 310/562
Acetone goes right to your liver so Im told... I grew up using this stuff constantly but now Im being told that it's real bad for you and to wear gloves...If its broken off down inside a hole you may have to hit it with a small end mill to get a flat surface to drill into. The angle breaks are kind of a bitch. Tough to do on vehicle. Once you get a hole in it (I'd use a cobalt drill) using cutting oil at a relatively slow speed then soak in a 50-50 mix of acetone and atf (best thread release known to man) and use appropriate size easy out.