1st part in an assembly has a fixed position,and I can't match planes or origin with the system's.   Is there a way around that?   I'm putting together a spindle and I want the shaft to turn; however, as it is the 1st part imported into the assembly it's fixed, and the planes are not even coincident, section through the assy goes at a weird angle.   If I start witn another part, the same thing happens.

Any ways around this? 

Thanks.