Prepped Backrivet plateI bought a 1'x3' 3/8" steel plate from my local steel yard. We picked it up from the oily floor after moving a small truck off of it. But it seemed straight and relatively smooth.I picked the best side, hit it with an orbitor sander, filed the edges and laid it on an EAA table. Used some of Vans packing box to create a flush surface. Works great so far. Don't see the need for a perfectly milled surface (yet). We'll see.