Well, here's how I'm doing the wood screws.  I'm using the loft compound object in 3dsmax, with a straight line (spline) as the path, and two Ngon splines as the shapes.  The loft tool in Max is quite robust, and a big time-saver for modeling objects like this.  I was able to loft this shape in about 5 minutes, once I figured out how to extrude the treads in the bevel deformation curve graph.  Unfortunately, I don't think this part of the WIP will translate well into an instructional how-to for users of other applications, because the loft compound object is a specific 3dsmax tool, but this shape could be obtained several ways using standard poly modeling tools in vaious apps as well.  JUst search out a tutorial on how to model a screw, and I'm sure you'll find many useful results. This is the same technique I used for the hex screws I posted earlier too, but these new screws will be wood screws, so the shape is a little different at the head, and the bottoms need to be pointed.

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