I dig what Earl is saying. He is talking about a shroud over the
lock like the high security option on some older coleman vacs where a large flat bar slides into the puck
lock and then the
lock is closed. Like a box with one side open to slide the
lock into. Resists twisting with a pipe wrench and attacking the
lock body. Either way has the keyway exposed, obviously, but the shroud covers the
lock completely where the ring leaves the body of it open to attack. I highly recommend using solid stainless pucks vs the newer American 2000 series or the cheaper(not pro) Master that are cast body pucks. They are easily defeated compared to the real deal solid steel units.