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If the cage nuts look rusty, tack the brackets (nut holder) with a mig prior to taking them off, let em soak in a good oil as well prior to removal
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Jim,
Can you elaborate on this for me?

Would I be tack
welding the cage nut to the bracket prior to removal just
to be safe? Can you get access to all 4 of the cage nuts
in this manner ( for welding )? It's an interesting point
you make.