Hey people what's up?

I'm obviously new to these boards, so i outta introduce myself before requesting help from you ATV Gurus. My names JP, and I ride a 04 KFX400. Pretty much stock, other than the Nerfs and skidplates, and tires. My problem is this.

I hit a tree goin 50mph. It sucked, big time. Fortonetly, there was minimal damage to the KFX, where that the left wheel took most of the impact. I had to repace the rim, and my rotar is tweaked a slight bit, which i will have surfaced, but I am baffeled as to how I replace the obviously out-of-wack spindle shaft. I have ordered the new parts, but I can't figure out how to get the old one from out the spindle. Any ideas? Should I just bang on it with a hammer?