I assume you are using a puller which is bearing against the blade bolt temporarily re-installed (loosly)?
If so, put as much tension on it as you dare, then apply heat (via a blowlamp) to the blade adapter.
Only ever had one fail to come off in 20+ years. In that case I had to resort to a power hacksaw and split it.
phil_saunders@bigfoot.com
Phil Saunders
October 2008