It's an item from Real Bull, rather than Seig, but it is to the same specs, apart from the 100mm flange. There are several RB dealers here in the UK, but as far as I know, Amadeal is the only one offering it.
The only US supplier of RBs which ever gets mentioned on this group is Big Dog Metalworks < >. Their 7 x 14 has a 100mm chuck, and judging by the picture, the spindle has a flange to match. Maybe you could contact them to ask if they can supply the spindle.
Andy
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--- In 7x12minilathe@..., "machinist1930" wrote:
Is Amadeal the only place the 100mm spindle is available from? Just checking if there may be a US source. Seems like no, but figured I'd ask in case I missed it in my searches.