Thanks samwisemcg that's what I was hoping. I'm doing the same job on a 247 and as you say the silver ones are a good fit. I'm leaving it under tension tonight with a chain wrench wrapped around the legs.

The bearing kit is good value at £24 as well

Managed to get the gear off using the puller kit above, a chain wrench to hold the legs in place and a heat gun on the gear. Don't use the tapered tip that's supplied with the kit just put the flywheel nut back on and use that to centre the puller spindle. Came off immediately once I did that. Thanks to every who has posted advice on this job.