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Looks like that tap is dry - no lubricant. Bit of a lesson there. Regardless of chasing out a thread or tapping a new one, always use lub as the task is very high friction at best. Those coulpings must be pretty hard as well I am guessing? How close to the threads are your welds as maybe they closed up a fraction from that?
Anyway, mean set of rails darren, but don't ever call my barge heavy after seeing these!!!!