In the course of building my Tolman Skiff, I bought two new large "C"
clamps for about $10.00 each. When I got home, I found they are of an
unusual design. They have a push button that allows the screw to slide
until released and then you tighten it normally. They also seem to be
made of some alloy as they are lighter than steel ones of the same
size. This concept is just what I need to replace the bolts and nuts I
use to hold my nesting dinghy togetther if they just had a deeper
throat. Anybody seen such?