Elna standard bobbin case.
Bobbin Case - (Standard)
Sewing, Embroidery, & Quilting Machines - Parts & Accessories
Bobbin Case Tension Spring, Singer #40394 : Sewing Parts Online
Singer 401 403 404 500 503 Sewing Machine Bobbin Case Original
This clear plastic plate slides into place and covers the bobbin and stops it from jumping out.
Clear Bobbin Cover (Square)
The Bobbin Case is used as a replacement part for sewing machines with front-loading bobbin systems. It may also be used as a spare bobbin case in
SINGER | Spare Bobbin Case for Sewing Machines, Tension Screw to Sew Thicker Threads, Fits Class 15 Front-Loading Bobbin Systems - Sewing Made Easy
Sewing, Embroidery, & Quilting Machines - Parts & Accessories
Singer Bobbin Case
SINGER Spare Bobbin Case for Sewing Machines