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STEVE PREPARING SAND BOX FOR RIVETS: The first of four butt straps being bolted in prep for riveting. In the foreground is the rim of the cast iron top of the sandbox. The top of the box fits over the outside of the sheet metal, and the bottom casting projects up into the interior of same, to help shed water so the sand stays dry. after riveting, the bottom rim of the sheet metal needs to be flared a bit to slide over the bottom casting, and compensate for draft on the un-machined casting (this ought to be fun!).
Photo by Rick Brigger