I'm doing mine as we speak. I found that constant PB blaster and 1/4 socket 5mm 6 point to twist off a smidge spray, on a smidge, spray, off a smidge, spray, on a midge....this helps wick the penetrating oil into the threads. I took a bunch of pictures so I'll post about it when I get the damn HP oil drain to line up (nothing to pry against to move the charger forward). Taking a dinner break so I feel your frustration.