if you make sure the blades shaft nut etc go backtogether in the exact same position it wont need balancing!
i changed my seals thust washer and bearings
its actually a piece of piss, the hardest but was getting the nut to tighten at the end of the job and stop in the right position it originally was, think that took me 10 mins or so lol
http://cgi.ebay.co.uk/Turbo-Rebuild-...item5adbf0d7ad