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Adjustable A-Arm Fabrication

I am considering fabrication of adjustable upper rear A-arms. The raw ingredients would be the original A-arms combined with a suspension bushing called Johnny Joint. The factory bushing mounts would be cut off and a threaded coupler (long nut) would be welded to the A-arm and reinforced. The Johnny Joint looks promising and perhaps better than a heim joint because it has a urethane bushing, a grease zerk, and can be serviced. The following picture is a crude mock up of the plan. Please let me know your thoughts about this. Does it look like it will get the job done? Will it be durable and safe? Thanks in advance.

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