We had one in the shop that had taken a hit to the handwheel. And it was so bent-up that we couldn't even get the handwheel off. That one ended up as "unrepairable." Are you able to get the handwheel off of yours? That might help determine if the wobble is from the shaft being bent or if the handwheel is on crooked.
Smacking the shaft to nudge things over, sounds like a good idea.