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The reason for grinding the bolts flush was because the plate was welded to the floor, eliminating any bolt heads, threads or nuts visible from underneath. Similarly, the air tank was mounted to the side of the recessed section of floor using bolts welded to 6 x 1 1/2 x 1/8-inch plate, which in turn were welded to the outside of the "box" to spread the load. I then installed Dynamat to reduce noise and heat transfer, as the exhausts will run behind this area. View Related Article
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