By the way have you tried the sweep tool for creating a bolt? Create the spiral, then draw a profile for the thread, then sweep the profile along the spiral.
Sorry, it took so long to answer. I am not on this forum much lately.
I have used the sweep tool to model the bolt before, I don’t remember exactly how I did though.
I have been busy digging into Blender and 3d coat, but did start working on a new Hexagon tut today.