Another two cents worth: I, too, have used the solution that Tod-- HTMills--wrote of. I closed the original mouth and opened one just as low as I could on my first M15 "Joy" and now on my last M15 "Rejoyce!". It worked well then and it works well bow. But instead of the weak and easily lost overboard stop, I just drill holes through the slide area and insert a large (2" by 1/8") cotter key through the holes. More than one set of holes allows me to set the boom as high or low as I wish. John R. Butler theoldcat@cox.net