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I think that it rather depends on the overall value.
The price of the shaft is easealy calculated, and often listed by most supliers, depending on gauge, lenght, quality and eventual acessories.
In fact it is a "spare part".
Rather diferent with the alignment, wich is time consuming and sometimes a hell of a job. So, it's value is more inpredictable.
So it make sense to have diferent prices.
Unless a forfait price have been stablished in advance, or overall price is to hight, it may be fair.
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