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Hi John,
If you have a decent finish on the steel, you might try a little diesel or kerosene on the area. Wipe it off so it looks dry. Then blow a little compressed air across where you think the crack is. Hold it so the light is good, and you can see a little tail of kerosene lift out of a crack that you couldn't see by just looking at it.
Don't know if it'll help, but it's worked for me. I don't know if you might not just listen to that voice in the back of your mind. Chances are other folks will have better ideas.
Good luck with it, Craig
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