Brake bleeder? Heat is worth a try but keep in mind any moisture inside the line will boil causing pressure or steam. In my experience the bleeders snap yes you can drill and tap but its tricky surgery because you don't want to drill into the seat.
That's the idea, drill to, or thru the seat, you're installing new of both in a few mins, just need the pipe thread to seal.
No "tricky surgery" required, just a drill and tap. lol
Cheers
