I need the piece that goes inbetween the router and the flex shaft.

I recently purchased a Sears router combo with flex shaft on craigslist. All the attachments came with what was needed. EXCEPT the flex shaft. There is some piece that goes inbetween the router and the flex shaft I need to buy. DOes anyone have the name it is so I can buy it?

Try on line. I think Sears has parts lists with exploded drawings for all their power tools.

Where would I look I tried.

Try searspartsdirect.com. I googled sears parts. You will need the model number.