I hate the task myself. I recall Sam saying a cutt off wheel and then a die grinder, which made a bunch of sense but I noticed it's kind of risky cause you can literally cut right thru. Today I decided to double stack two cutt off disks and it was awesome! Worked great! No danger I got it almost flush without risk. I think you guys should try it.
But I'd still like to try other ways other than the cutt off wheel to die grinder or die grinder alone just to try out. Any body use other methods and what are they?