Trying to figure out your Singer tucker attachment? These extracts from “Machine Sewing” a manual for home economics teachers (1930) might help… (is anyone else there as smitten with old school sewing attachments)?
I am actually longing to make this tailored dress…. Sewing machine attachments like tuckers are novel time savers!
For SINGER sewing machine enthusiasts I am also posting this attachment list from the book, in case you are hunting down accessories for your machine.