Back in 2014 I wrote an article arguing that the only right way to rig a boom preventer was from the boom, near the mainsheet bail, to the bow. (I will call these bow preventers for the balance of this article.)
But I still see a surprising number of boats rigging "preventers" from the boom, directly above the toe rail or a little outboard, to a fitting on deck, directly under the boom (in its running position) or slightly forward of that. (I will call these amidships "preventers"*.)
So I want to revisit this.