Sandy, Matt,
reference cutting the recessed hole to accept the reel seat 'hood'.............
I tried a 20mm broach yesterday, which magically has a 6mm centre pilot dab type thing so keeps everything true.
The rubberised cork was a little sticky but once that was tweaked the cork was a dawdle and within 10 - 15 seconds I had a neat looking, centred, shop bought internal bore that the hood slipped into nicely, it also leaves a rough ID for the glue to key against.
It was twisted by hand - absolutely no lathes or drills required
Top find!
Iain