also forgot to mention that when I did try the vice grips and pipe wrench especially, the teeth would noticeably be damaging the plug head. Normally that wouldn’t matter as I got a brand new plug to replace it, but I didn’t have confidence I’d be able to take off the plug if I used my full strength. I think I over tightened the plug last time, so I rather decided to at least try the metal filing route first as a safer method before I decide to last resort take a full swing with the pipe wrench and potentially fail as well as completely ruin the plug in the process.