I'd tried that way, DADGBE, but it didn't do the trick - it was too tightly wedged. It's a well built axe. But the tiny screwdriver did the job OK.

Now, while I'm waiting for the gizmo to arrive, I'm taking the opportunity to give the stripped down guitar a good clean, for the first time in years. Scraping all the gunge off the fretboard and all. Maybe put some polish on sparingly, but I'm not at all sure about that.

With the strings off, the bellying has greatly reduced of its own accord. I'll stick a weight on top and hope that it reduces entirely before the Bridge Doctor arrives, which would make it easier to install, since I wouldn't need to be using it reduce the bellying.