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Originally Posted by SD Blue
On my oil cooler lines, I made a 1 1/16 flare nut wrench by cutting an inexpensive wrench with a Dremel tool. Worked great and it still works as a box end if I need it.
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This is similar to my wrench and should work fine if the line nuts are not too tight. The problem is, once you cut the circle of a box end wrench you weaken it and it will splay out when some serious torque is applied. I spent some time reinforcing the outer circle of the box end by welding tool steel to it and heating, grinding and quenching and such. Then I carefully ground it to a nice "precision" looking shape so it wouldn't look so ugly. A 12 point "Crow's foot" would be another idea for this type of tool.