Thanks for that... that's one of the methods I saw online.
I'll see if I can pull it off gently tonight, otherwise I'll get supplies from the green shed tomorrow to build a 'bushing extractor'. SHould be easy enough.

With the 12 strings, you may be able to drill through the bushing hole at an angle towards the cavity. It shouldn't be much more than a few cms. Mine was like that, started near the top of the bushing hole. I ran a long speaker cable that I then fished out through the f hole.