elephant, when you said you'd bought a machine on eBay for a minute I thought you'd fallen down the rabbit hole that is vintage machines! Nice restraint on just having the bobbins and feet!
I'm about to list some vintage sewing machine bits on eBay, but my phone has decided it won't send pics in messages and so I'm trying to figure that out first!
I have an entire Singer 128K's worth of bobbins and parts as the machine timing is screwed, so I am going to dissassemble it and sell the parts on the Bay and whilst I'm at it, the Simanco parts for various machines, got over the years at car boots etc - we have often bought entire boxes of parts we already have, just to get one part.
It's going to be a long job though as I will have to look up all the parts numbers and figure out what they are!