Here I've switched to the flat bottom shovel. The angle of the handle on the spade prevented me from reaching the back of the oven with it (the handle kept hitting the brick arch.) I used a three claw cultivator to scrape the sand off the sides and top of the oven. I could feel and hear when I reached the clay; at which time I turned the claw on its side to gently rake the sand away from the clay. I only found one soft spot that I must not of packed well enough. I used my dead blow hammer with light blows to compress it.
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