Did you have a tough time getting the nuts off the first time that maybe the studs fractured on removal then fractured even more on installation?
I'm sure those studs can be replaced but there might be a lot of disassembly required.
Give a good repair shop a call and bang their ear a little. Maybe you can do the bull work and let them replace the studs in the hubs. Maybe these guys?
http://segwayofannapolis.com/