Q:I'm an architect who has also done my fair share of swinging a hammer. I enjoy your column, but once in a while you miss on some details. In this instance, you recommended fastening shear ply with ...

DM2 feedscrews for injection molding, extrusion, and blowmolding reportedly produce 15 to 20 percent more output than a typical barrier screw with 25 percent less shear. The DM2 name refers to the ...