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 The holes for the flange nuts...  The holes for the flange nuts took a little time, first with a 1-inch hole saw in the press drill …  … then opening them up into...  … then opening them up into a hex-shape using a die grinder. The flange nuts then fit snuggly from below.  There are two items of note...  There are two items of note here. First, I welded the crossmember to the chassis rails as this will be hidden under the new spring mounts, and the joint was already weakened by someone previously grinding the tops off the factory rivets. Secondly, I used a 1-inch hole saw to drill the top of the framerail to allow clearance for the bottom of the bolt that holds the spring leaves together.  Finally I could tack-weld...  Finally I could tack-weld the spring mounts to the top of the framerail, after double-checking all diagonal measurements. The flange nut was also tack-welded to the mounts at this time. I’ll go back and fully weld everything at a later date when I’m happy everything works as it should.  I purchased a couple of short...  I purchased a couple of short lengths of seamless tube with a 3/4-inch ID to fabricate the spring perches. These needed to be cut down to 1 3/4 inch in length to match the spring width. My local industrial tool supply house stocked these as well as the flange nut, and the fasteners I’ll use to bolt the perches to the axle.  Posies recommends setting...  Posies recommends setting the shackles at halfway through their travel, which equates to 45 degrees from vertical in this case. This gave me the location of the perch tubes in relation to the axle.  As the holes in the I-beam...  As the holes in the I-beam are 3/4-inch diameter, I sourced these Allen-headed shoulder bolts to attach the perches. The nuts are Grade 8, the bolts are actually a higher tensile alloy.  Ensuring the springs were...  Ensuring the springs were level in relation to each other, I clamped a length of square tube to each shackle to align them at the same angle before tack-welding the perch tubes to the 1/4-inch plate brackets I’d fabricated and bolted to the I-beam.  As mentioned in the text,...  As mentioned in the text, these perches are temporary and will strictly be used for setup purposes. I didn’t use the seamless tube for these, and the brackets are not exactly finished nicely, but they’ll serve their purpose. Note the inside edges of the 1/4-inch plates are radiused to fit tightly inside the channel of the I-beam.
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