Ok, we're going to need to turn this into a capsule like shape, we'll do this by going into vertex mode, and select one half, and move that end out quite a bit. I'd suggest you go into front view for this by clicking the on the tool-bar




Now we're going to scale it with the middle scale button, to make it smaller, and move it into position over the handle


Now dupilcate the sphere, and move it on the exact underside of the handle, try to make it as deep in on the handle, as the top sphere is.


Now select both spheres, then hit CTRL+G, to group them, then select your rotate tool, and hit CTRL+D to duplicate the spheres, then rotate them along the edge, keep doing this


Now smooth the handle twice Polygons>smooth


Combine (polygons>combine)all the spheres, then select the handle first, then select your combined spheres, then boolean difference them (polygons>booleans>difference), if your screwdriver handle dissappears, undo all the commands until your spheres are seperate, and then boolean them individually, if that doesn't work, start over with making your spheres. (what I had to do)=


Ok looking pretty good! Now we will start on the screw-drivers shaft. Create a polygon cylinder with the same settings as the last one, then scale it with the middle scale button to make it smaller, then scale it out on it's X axis


Now we're going to make it a standard bit end, select the three spans on the -X end, and scale it on it's X axis to make them closer together and then move them in the -X direction


Now select the two end spans, and scale them on it's +Z axis