Thanks Malcolm - appreciate the feedback. I'd seen in another thread that someone had damaged the cast steel clutch with a bit too much effort so was mindful not to repeat that with mine. I'll try tapping the threaded collar with some hardwood first - if no luck then I'll source a gear puller.
Good to know that the I can use the SB45 clutch bearing - I'll replace the old one as it's a bit rattly now.
I found out that the mower was purchased from new by my grandfather, passed on to my dad and now me. Love having that piece of history in the family.
