Withholding Allowance & Michigan Championship

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So this is going to be a two part question. Our welds on our arm are starting to break and to my knowledge, there is no welder for use at the event so I had the idea of welding a new arm to be safe. The problem is that it weighs 35 lbs so it won't fit within the withholding Allowance. We could do it in two parts and replace one part before State and the other before world's (if we go), but is the withholding Allowance the same? And would the arm count against the withholding Allowance since it would replace a part? It would be the exact same arm as before, just new.