I just picked up set of Hope XC hubs on Mavic 521 rims for a bargain price on ebay, the seller said the rear bearings were a bit rough, which was an understatement to say the least, the hub had been abused and forgotten and the bearings corroded onto the axle and hub. Took me several days to get the bearings out.
Step 1 prepare a handy tool to support the hub
Step 2 slide a washer or old bushing on a M5 bolt and place in the end of the axle to protect it from the blows from the 2lb lump hammer.
That used to be a philips head, gives some idea of the bashing that was required!
Step 3 when it doesn't shift soak it in penetrating fluid for 2 days.
Step 4 when that doesn't work, spray verucca freezing spray down the hole in the axle to chill it so it shrinks and slides out of the bearings.
step 5 discover the whole lot was so corroded because the drive side oil seal was completely worn out, as were the o-rings in the axle endcap spacer thingammyjigs.