Originally Posted by
bkay
I have a box of black "special disks" that say they are "for classes 600 and 603 machines". Can't I use them on a 401?
bkay
Looks like the type B top hat discs are for both the 401 and 600 and 603 machines per
https://www.singersewinginfo.co.uk/s...tern_cam_list/