@Bodgeitandscarper I've been off round the interweb and it would seem that it is indeed a ruffler attachment.
I also found out what all those binder things do. They make and attach binding in one pass!!!!
Assuming of course that one has the dexterity to keep everything lined up and handcrank at the same time!
We'll see about that.
I have so far learnt threading and bobbin winding so we're all set.
I've given her a thorough clean in all the bits I could get at too so she's looking great.