The best laid plans are still subject to change. Original tank mount pockets were with a 1" wider and slightly longer tank. The flanges were wide, and the walls thick. I was building a tank that could double as an anvil. The .150" walls were machined down to .080", flanges changed the same way. Easier to weld as less heat is needed. The more heat put into the 16 ga bottom, the more likely it gets brittle around the weld, and wants to crack in the future. Rear mounts (the smaller ones) used to be the real long front ones. I re-purposed them, cut .070" radially off the flanges to decrease the width. I want to push the mounts as far to the back as possible, but also want to the flange to bottom weld to stay at least 3/8" from the bottom to tank sides weld seam. Made the simple fixture and knocked out the pockets. The rear mounts where just clamped into the vise, double checked for flatness with the digital protractor (one of the best $100 tools we have in the shop) and knocked out.
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