It is one of the arms that hold the bobbin in place when filling, drive end if I remember right
And is it a lower bobbin thingy near the base of the machine? I know singer moved their up in later models, not sure about the Jones CSs though... if you take a pic, I might be able to source a spare for you?
Poor Harvestman, that stinks.... what a complete div that repairman must be to not be able to repair one of these auld gals! He obviously doesn't want the custom.... go figure, eh?!
I've got mine finished and oiled today... it means so much to me as its the first flying shuttle I'd seen for years, found by my Eldests neighbour abandoned in a shed and it kickstarted this fascination for me with Steves treadle which is the model up from this
I'm going to take it to meets to use to repair my bush bros kit in the back of the disco.... she'll earn her keep for sure and no doubt, outlast me
And here she is sitting with her big bro... she is actually a wee bit smaller in the harp and bed width and I think the head of the machine is a bit shorter too. They certainly take different needles- the Medium CS is on standard industrial flat shanks whereas the Family CS uses a small round shank (DBx1). Waiting for them off the Bay before I can test her on fabric but the mechanism is running beautifully now she's fully oiled