Quote: w as for your trim holes exit1965, you could get a copper block and weld in your trim holes. the weld does not stick to the copper, and the copper block helps disipate heat at the same time to avoid warpage.
That is what I did. See pics. I used a harbor freight magnet to hold the copper against the back of the weld. If you work alone this really helps. I then welded it up with my mig. Take your time and work slow to keep it from warping. See pics.
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