I have found a very cost effective way for opening an closing the
companion way vertical entry door/hatch. Previously one needed to
screw in the knobs in order to secure the hatch in the open position.
I have placed a small spring cut to 1 inche with a large washer on
the knob screw post. The spring is adjusted with the knob, and puts
just enough pressure to push the blocking board into place to secure
the door in the up position. Works great!!!
S/V Bel Ami