Front wheel bearing!

Anobody here have any experience changing the front wheel bearings on vintage Vespa’s??

I am trying to change the bearings on my 1968 SS180, I have removed the wheel, and the large, strange links-threaded nut that holds the oilseal.

I can see the bearing but it’s impossible to reach and the axel is impossible to pull out.
I guess it is a really snug fit between the aluminum casing and the bearing… should I heat the casing?

HELP!!

Thanks!