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The reason for the alignment issue has to do with the geometry of the bed on the WW design. The bed has two angles and a flat that the underside of the headstock and tailstock must fit precisely into. Just getting the conponents to fit onto the bed is challanging. Since the bore holes in the headstock and tailstock must be in precise alignment, the most reasonable way to accomplish this would be to first fit the castings to the bed, and then align bore the holes. This is why the serial numbers are so critical. It is tragic that people go to estate sales and then sell off the machines in parts.