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Replacing a VERY worn out collar

Above is a new collar for a Floating Sub Shaft, that has never been used. Beside that is a Collar that customer brought to us to replace. It is severely worn out, to the point that the splines in the Floating Sub Shaft (below) created splines in this collar. It was worn out beyond repair. If the customer would have left this floating sub shaft and collar non-serviced the sub would have come apart, broken, and dropped the drill rod & tools down the hole (well that was being drilled). It would have been a much more costly endeavor to replace these parts, plus new drill rods and tools. The customer got in touch with us just in time!