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mcmyk
@Dammit
There’s a small arm welded onto the main arm which holds the brake actuation sensor, which you’d need to leave in place. The arm is ~50mm wide at that point so I’d go through it with a 50mm hole-saw and then weld in a tube with a 50mm OD and a wall thickness that matches the main pressed steel arm- which looks to be around 1mm.
The length of tube is going to have to be around 100mm to move the lower brake arm 80mm to the left.
I reckon a 50mm dia tube is going to be pretty stiff, and you could up the wall thickness to say 2mm for the sake of “nuke it from orbit”. Then gussets.