I'm trying to remove the bottom bracket from my old mountain bike but the cup side (non-drive) is stuck.

I've got the crank arms removed and have removed the cartridge from the drive side (Drive side being reverse thread) but the non-drive side is infuriating and is not moving in any direction.

The spline drive I'm using has almost shattered the teeth on the cup itself trying to remove it. I've let is soak in WD40 for now and will go back again shortly but I'm debating cutting it out with a dremmel as a backup (but I'm not sure if that'd ruin the threads on the bike).

Can I leave the non-drive side installed and insert the new bearing and cartridge from the drive side instead?
Or any tips on how to remove it from the bike?


\\before it comes up: I understand that the non-drive side is a standard thread (as the drive side is reverse). Counterclockwise should remove it.