Please contact Garhauer, who is a major player, if not the biggest in this
field
and ask how many of their vangs have locks.

You might want to check your facts. Hall Spar's Quick Vang is probably the
#1 selling solid vang. Garhaur's units which are very well made are seen
mostly as supplied equipment on new Catalinas.
S/V Express 30 "Ringmaster"
"Trains are a winter sport"