rebuild problems someone please help me
 

ok ive rebuilt my turbo before had no problems. well so this time i pull everything apart i clean it all with brake cleaner get it all cleaned up then install all the new parts in it and go to tighten down the nut on the end to hold the blades to the shaft and when i tighten any tighter then hand tight the thing wont spin at all? wtf anyone have any ideas? ive tried putting back in the crap stuff same thing am i doing something wrong i am doing everything the same way i did before.i dont get it.