Allow to say first, I am not terribly technical but I'm reasonably handy and I have a decent set of tools.
I am removing a POS drain out of a bathroom vanity sink. Unlike the drain I am replacing it with, the flange is made of silver coated plastic. The major malfunction is that the previous owner didn't putty it or seal it properly when it was installed and a decade of corrosion and goo is sealing it completely to the drain body.
The sink is a fairly soft material, maybe a fiberglass or plastic shell. I can't - despite using vise grips, channel locks, anything - get the flange off the drain body. I don't want to damage the sink but I think I'm going to have to cut the drain body off.
What can I cut through the brass with? This is a thick drain body, not just copper pipe - I have something that will work for that. I'd be cutting it through the threads above the lock nut. I don't know if my reciprocal saw would work and a hack saw will take forever (plus the space in the vanity is pretty compressed).
Any ideas are appreciated.