Where can I find a Mason's Plumb like this?
I was in Guatemala last week with a missions team and was taught to lay block by a really nice young mason, even though neither of us spoke the other's language. He used the plumb pictured below, which I've never seen before. As an engineer and machinery alignment guy, I was blown away by it's simplicity and accuracy.
Where can I get one? I've googled everything I could think of with no luck.