I installed one on my chart table and love it. It is a spring that just locks in place when unfolded to hold hatch/table open. Trivial to pick mounting points, just hold hatch where you want to lock it and mark the holes.
Only drawback for cockpit locker is if you bump it from the side it releases. Could be painful with a heavy hatch.
+
Happy Sailing! /||\
John / || \
/ || \
/ || \
/ || \
/ || \
/ || \
/ || \
/ || \
/ || \
/ || Hull 1118 \
/ || \
/ || \
/ Catalina || \
/ C320MKII || \
/ 2007 || \
/ ||_____________\
/_____________||____
_________/__________\_____|__
\ Lake Guntersville, AL l_
\________________________________)
\ | | |
\__| |_|