I finished a very heavy duty Octagon 150 today, heavy duty in the sense that its width is the same as the 200 built last year. It permits a 9" diameter hammer head that uses the largest S-7 dies made by Brian Russell. The cylinder is a specially made Norgren 4" diameter piece that uses larger air cushions to enhance air flows through the caps and the caps are taller than stock, too. Light treadle hammering gives the lightest short stroke taps that are desirable with crown dies, yet still gives the kind of power expected of a 150. I haven't shot a vido of this thing, but another 150 can be seen on you tube at jcl10000. I believe this new one is a might heavier than 150, closer to 160, and the one on youtube was right at 150.