When is an M bobbin case not an M bobbin case? When it’s made by different manufacturers for different machines! Currently, there’s a discussion on the forum for the owners of sit-down models of quilting machines about the M bobbin case for the Handi Quilter Sweet Sixteen/Babylock Tiara, and one of the members posted a picture of the black spring she was told to remove to use the pre-wound Glide bobbins. The problem is that my bobbin case DOES NOT have this black spring and I suspect never had it as I can’t recall seeing it.
So I took some photos of my only bobbin case — the one that came with my Sweet Sixteen machine back in April 2011 — so that I’d have them on hand for future reference. I took several photos from different angles.
The only ‘spring’-like thing INSIDE my bobbin case is the flat metal piece that’s screwed into the housing — you could not remove it without first removing the screw. On its inner side, this flat metal piece has a straight edge, then sweeps into a scythe-like curve. Also, note the width and shape of the bobbin case opening (not the ‘fingers’ surrounding the opening, but the opening itself) — it’s a sort of skinny ‘D’ shape.
As a result of this discussion, I went searching for M size bobbin cases on the internet and found that there are all sorts of variations of these. Below I some photos I grabbed from the internet. Notice the shape of the opening, the ‘spring’ shape, and the black spring (in some cases), and even a ‘pigtail’ spring. They are all a little different to the bobbin case I have. So buyer beware! If you purchase any old M size bobbin case from the internet, it may not be the correct one for your machine!