2019 Mk8 Fiesta ST-3 Mountune m260
Some other ideas that may (or may not) help:
- If there's enough of the Torx head left, try tightening it to get the thread moving before trying to wind it back out.
- If you use the freezer spray, try warming the engine up then concentrate the freezer spray on just the screw as much as possible.
- File a straight edge on the screw head to make it easier to hit (with a punch it screwdriver) or grip onto
- Depending how bad the head is, you may be able to get a larger (cheap/disposable) Torx bit and hammer it into the head.