We're definitely getting away from irony here. Reminds me of two an a half men (that running gag still cracks me up. How ironic
).
It is ironic that Singer makes bobbins for its own machines and they don't fit. I doubt my local supplies shop would ever touch Singer made domestic parts. Very sad sign of the times, though. Cheap rubbish that doesn't work is the new normal these days (sigh).