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My first attempt to fabricate the shunt didn’t fair well. Although the stainless cuts easily with aviation snips, it is too hard for titanium coated drill bits in a battery powered drill. After regrouping, I was able to cut slots with a Metabo (side grinder) and a cutting wheel. Installation was easy. I placed the new shunt on first followed by the wire lugs. It worked just as the original without the shunt. It still pegs the needle on initial start but it comes down after a few seconds.

I believe this as a success. A big thanks to Jerry for steering me in the right direction.