If you can mark the compressor blade, shaft, and shaft nut all in relation to one another before you take it apart....you could try and re-balance it yourself (by lining up those carefully placed marks after the rebuild).... Otherwise (and it sounds like you've already taken the nut off...) have a shop do it.
You can however buy a turbo rebuild kit and rebuild it yourself....I bought one on ebay. A non BB turbo isnt that complicated to rebuild if you have an exploded picture diagram of how they go together (which can be found on google).
-m
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