Yikes.  I don't use Blender but IMO, the first problem is the cylindrical parts are too low poly.  I'd at least double them before doing anything else.  After that, I'd run a row of polys either side where the faces join to help Poser stop smoothing it out too much.  Yes it adds to the poly count but it shouldn't be a problem on a modern system.

Also, there's a stray vert on the handle, which may not cause you any problems but if it was me, I'd kill it.

Coppula eam se non posit acceptera jocularum.

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