My solution for the bobbin problem - and this works well for me...I have (blush) 13 sewing machines and all but 2 of them sew and I try to use them all... rotation as much as I can.........I have EACH machines bobbins in its separate PILL HOLDER..........you get them at the Dollar Store......and on each of those (weekly size ) pill holders, I have the name of the machine taped on, that the bobbins go with,.......so I can easily pick up the weekly pill holder holder that says BERNINA on it, and know that is the correct one........on the Singers, they all have their names, like ANDY (my 1940's little tan 301 from Anderson SC plant( his bobbin case says ANDY on it.....and the PINK GIRL (the Pink Atlas) says PINK GIRL on it..........am I making sense here? the pill boxes, hold a weeks worth of medication so its got the 7 slots and I find that all of the bobbins seem to fit ok in there...KMart and Wally World have them too, but the dollar store is the cheaper one, of course. If you have a lot of bobbins, there is a 2 week size for medications too, I think I saw that at KMart........hope this helps...