If you saw my video, "Reloading in a Small Space", you know I use a Lee Precision Bench Plate on the "Harry Potter" bench to maximize my use of that small space.
I love that system, but with the original wooden bench blocks, they have a tendency to walk out of the clamps under heavy use. This isn't a real problem, you just reset them and tighten the screws, but it is annoying enough that I made my own homemade fix.
Well now Lee has done what I hoped they'd do. They've made steel bench blocks with a raised stop that keeps them from walking out of the clamps.
This video shows how they work
and, if you haven't seen it, here is the original video showing the Harry Potter bench