Originally Posted by
bkay
I thought this was the chain stitch plate.
The T&S white top hat cams are mostly the stretch stitch cams (if I remember correctly, there's also a duck). I understand they only work with the 700 machines.
bkay
The items pictured are the "Bobbin Case Cover" and "Thread Guide". You still need
the throat plate for the machine to chain stitch. For the 758/778 the "Chainstitch Throat Plate" which is shown on page 38 of the pdf or should be page 32 of the paper manual you will see that it is different from the straight stitch or zigzag plate. For the 778 the part number should be
171467. The needle hole is oval and there is a "doohickey" (I haven't found an actual name for it) on the bottom side of the plate that is needed to make a chain stitch. The throat plate number for chain stitch on other T&S's would be
21913 or 21915. I only have 21913's.
Janey - Neat people never make the exciting discoveries I do.