<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Dagnabbit you're right: I wish I had studied the thing more thoroughly! What I think, is this:  The let-off (or set-off) button cannot drop down, because with the HAMMER flange in place on top of its own flange, the heel (if you can call it that) surrounding the birdseye, cannot rotate upwards as it is blocked against the base of the hammer flange. In point of fact, it seems superfluous for the buttons to have flanges with centres at all. They do not need to rotate/move. I suppose it was perhaps simpler to manufacture centre-pinned flange arrangements than to make an angled fixed piece for each button. Also, with the hammer flange unscrewed and lifted out of the way, the set-off (or let-off) button could be flipped upwards in its flange to allow for screwing the button up or down to adjust set-off.  Cumbersome though! I'm sending the two pics again just for ease of reference. Best regards, David. <blockquote type="cite"> <pre wrap="">David, After looking at the picture a bit more, another question came to light: What keeps the "let-off" button in position??!! It looks like it would just drop down on the first stroke. Does it have a cord or some such to keep it in position? Best, Joe Joe Garrett, R.P.T. Captain of the Tool Police Squares R I</pre> </blockquote> </body> </html>