I missed this discussion about chain stitching Kenmores by a couple of years, but I just now discovered what this little box of parts is for! I have six Kenmore machines: two 158.14000, one 158.14002, one 158.13580, a 158.17300, and a 385.1284180. Oops, forgot my little 3/4 serger. Most recently I acquired the exceptionally clean (looks brand new!)158.17300 at a flea market for $15. It looks just like the one pictured with the cute kitty standing on it. What a find! But back to the chain stitch gizmo - the "mysewingmachineobsession" blog shows a photo of the bobbin area, and indicates there is a small hole in the hook for the adapter to snap into. Alas none of my machines appear to have this hole. I am trying to make a list of Kenmore machines that have the hole and can accept the chain stitch adapter. Maybe if I allow my hubby to collect a few more tools in his shop, he'd let me buy another Kenmore, if it's the right one! So far, my list includes 158.17550, 1802, 18034, 158.18022, and 1757. I would greatly appreciate any additions or corrections!