Hi Tony, like your good self, i'm not familiar with that particular reel however its got to be something easy. First, try removing the anti-reverse switch. If it doesn't have a screw, try moving the anti-reverse switch to the centre position and see if you can jiggle the main gear out.
Failing that, turn the gear and see if you have access to the back of the main shaft. I'm sure you've probably tried this already. If you still have no joy, send it my way. I'd love to have a play.
Cheers
Red