400 NE, if you pull up the link that cloffe posted back on P. 2, to a catalog from 1914, you'll find the company's description of the Webley screw grip. The accompanying drawing clearly shows that the spindle is threaded. (See Side 5.) Likewise, Ron Forsyth's article in Shooting Sportsman (The Ubiquitous Screw-Grip, Sept/Oct 02) includes an even clearer drawing of the Webley-Brain patent of 1882. That drawing also shows, quite clearly, a threaded spindle.