Socket worn - one edge / corner out of shape - should still work. Approx 10 mm socket.
Antique Vintage Table Winder Crank Handle 1/2 inch square. 1
Brass Adjustable Table Winder Hand Crank Handle
Vintage Table Winder
Handle Chest Handle Etc. Antique Brass Folding Handle Large 19Cm
19thC Brass Table Release Handle
Vintage Table Winding Handle B991
