Inner CV joint stuck on axle, can't remove

[desert_porsche]

Hi guys. The rear axle inner CV joint boots my 2001 Boxster S Manual split open, and I've decided to replace the inner CV joints and boots. I was able to remove the axles from the car without any problems. I removed the circlip snap ring that holds the CV joint on the axle. However, I'm having a really hard time removing the inner CV joint from the axle itself. I've tried hammering on it with a thick piece of metal and a sledge hammer, but it simply refuses to even budge. I've tried searching this forum and googling my problem, but the only results I can find involve the axle being stuck on the transmission mount, which is not my problem. Do you guys have any tips for removing a stubborn inner CV joint from the axle?

Thanks!