Did you put any kind of penetrating oil onto it?
You are correct in not trying to press against the whole drum.
It may be that the piece of pipe you are using as a backup is not heavy enough.
I would soak it well with B'laster or some such, screw a nut on it to give additional
bearing (screw it where the end of the bolt is flush with the surface of the nut
and with backup well in place, try driving it with about a 3# hammer.
In a lot of cases impact seems to work better than steady pressure.
If you use heat it needs to be applied SUDDENLY and heat ONLY the hub, NOT the bolt.
It is differential expansion that does the trick. My grandfather could do things with
a teakettle of boiling water that I could not do with a welding torch!
One way of doing this is to fit a piece of rubber hose around the bolt snug against the
flange, then pour maybe a quart of boiling water on the flange, wait about 2-3 seconds,
then strike while the iron is hot. Once the bolt comes to the same temperature as the flange
the advantage is gone. Putting dry ice on the bolt before you do this might gain some
additional advantage.
--
George Downs Bartlesville, Oklahoma