With the 201-3 I simply used some Tri-Flow Superior lubricant and applied heat and then waited.
When I thought it was "ripe" I used my Chapman screw driver bit being very careful to hold the driver as vertically as I could. Then applying downward pressure I turned left. (Not hard to do since I am practically a socialist, believing in universal Health Care and all)
I felt just the slightest give and then it freed up.
OOOHHH Baby, look how gunked up it is in there.
All clean and shiny. Don't forget to put the oil in the race before you put the bobbin case in. It really needs it.