When I worked for Ford Europe in the mid sixties (on warranty repairs anc claims) the spot welds on many Dagenham cars were so bad that customers used to complain about groaning noises: which were badly made spots on unimportant places like the sill to floor pan..........
Ford's standard "Service Fix" was simply to spray the affected area with silicon lube: to stop the noise of metal rubbing on metal!
Nice.
We often used to puddle braze parts like wings, rather than spot simply drill a 1/4" hole through the top surface and puddle braze onto the prepared inner wing.
Far stronger.
And much neater if your brazing was good.
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