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They are suggesting that you do not weld it for good reason. We are giving you real world suggestions. The welding around the perimeter, concentrates the heat and work hardens the shaft at the weld and changes the makeup of the steel, making it brittle. This is why they suggest alternate means. Splining your existing shaft or macining it to a double "D" configuration are your best bets.
Call the tech people at the manufacturer and ask their recomendations.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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