rfostoria
Steve,
On such older impeller fans, you have to have a special fan locking tool (part no. T130 for models Omega to Legend II) to keep the fan from moving while attempting to remove it.
I think you saw this video, didn't you?
[MEDIA=youtube]uL2Uuo54xRQ[/MEDIA]
Another user has a tutorial for how to install a metal fan into a Heritage II Legend:
(part 1)
[MEDIA=youtube]s6Q8J0bam1k[/MEDIA]
(part 2)
[MEDIA=youtube]QLIbZJRB8ZM[/MEDIA]
~Ben