I am trying to model a pepper mill and the subtraction goes crazy. I used a spline to get the outside shape, then rotated this around the axis 360 to create the solid.

Then I created 2 different size drills (1.5" and 1.75") and extruded them various lengths through the solid. After subtracting the drills from the shape, I am left with some weird thin partial shell line drawing thing.

Thoughts?

Chris