C-Clamp, Singer (Vintage Original) bobbin but can be purchased separately BOO-FRM20897-157 Model:99K EL1771 indicates an original bundle

but can be purchased separately

then check back from time to time

Because the original spring-loaded screws (as seen in photo) are so often missing or displaced from the old Singer Pinking Attachments

To have the mechanics of making a buttonhole with a sewing machine versus the painstaking challenge of sewing one secure enough by hand was a engineering marvel

A Singer Sewing Machine Attachment - GAUGE PRESSER FOOT Set - which is complete with all the gauges

C Clamp, Singer (Vintage Original) bobbin but can be purchased separately BOO FRM20897 157 Model:99K EL1771 indicates an original bundle but can be purchased separately then check back from time to time