While making the exhaust flanges I broke one of my last 3/16" center drills and lost the last bit for my Vargus de-burring tool, so off to McMaster-Carr for some more center drills, bits for the de-burring tool and a new tool holder for it. The old holder was so worn after 40 years that the bit would not stay in. I asked for a new catalog, knowing I just don't buy enough anymore to rate a 4000 page tome like this. After much begging and offers to buy one or bribe a company official to get one they found one with a slightly damaged cover. It arrived today. It's wonderful. This will make finding things I need so much easier. The pages are bigger and it's over 1000 pages more than my old one. Oh yeah, the new tools work great also.
The flanges rest on a stack of 2 nuts tightened together with room left at the end for the flange and a nut to hold it tight while welding.
At first I thought I could just clamp a straight edge to the 2 end bolts and adjust the rest to just touch it. It turns out you can't clamp it tight enough. You can create a lot of pressure when tightening the nuts and it pushes the straight edge away from the end nuts.
It also takes some care to tighten the top nut down while tightening the bottom one up to get the top nut just on the line.
I then tightened the nuts together and readjusted them as needed until they just touched the straight edge while not letting it rock.
Then work on the same nut at the opposite end and slowly work toward the middle..
I need to add a support to hold the 18 degree angle while welding. The weather is warming so I may be able to start welding soon.