To make the Clean-Out Blade I just held a piece of scrap 16 Gauge steel up to the side of my offset side firebox and traced its curved radius onto the steel with a Sharpie felt tip pen - then I cut the steel with a benchtop open throat hand shear. I hammered it flat and filed the edges smooth.
The handle was a 32" length of 5/16" diameter steel rod held in a vise, heated to red hot with a small torch, and bent in half with pliers while it was still soft. I held the two pieces together with a couple of magnetic welding holders, and welded the handle in place on the blade, and then spray painted it black. It will hang on the side of my smoker/grill with S-Hook.