How To Replace Trunk Torsion Springs with Lift Struts

I did the measuring mounted & welded the nuts to the hinge lowered the trunk lid 6 inches , mounted the strut rod a close to the floor as I could ( as per instructions) I even removed some of the hinge support to get the strut rod as close to the floor as I could. I went to close it and the strut rod bent and the nut I welded in popped out. rewelded the nut on the hinge, this time not wanting to take any chances I welded the washers also. mounted everything went to close it and bent the second pair of strut rods.

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just a guess but i'd say you had something out of alignment or at a weird angle.