What breed of attachment? Genuine Bridgeport or aftermarket? When I got mine I was told to make sure that it was complete kit including shaft as "they aren't all the same".
No idea if this is actually the case or, if so, which ones are different
Hope you get to use yours. Mine has been sitting on the shelf for 12 years or so. Guy I got it from said it had never, to his knowledge, ever been used. Got to be pushing 30 or more years old by now.
Clive.