SINGER MODELS 401A 403A 404 COMPARING THE BUILD AND FEATURES

PLEASE READ: LOOK BELOW FOR START TIMES FOR EACH MODEL
00:00 Intro & Common Build parts and Features.
35:45 Model 404 Build and Features
51:20 Model 403A Build and Features
1:13:16 Model 401A Build and Features
1:49:35 Attachments Sets Parts & Features
2:26:23 Opinions of a Restoration Man

Compare & Review of these all-metal vintage Singer Sewing Machines. The common and different features of each machine, some history, close-up pictures of parts taken out of machines.
My personal opinion of the models.
ANDY TUBE;    / @andytubesewing1953  
MODEL 401A;    • Trouble, a Singer Model 401A Slant-O-...  
MODEL 403A;    • Regina, a SINGER SLANT-O-MATIC 403 SP...  
MODEL 404;    • SINGER MODEL 404 RESTORATION SERIES  
MODEL 301A;    • Coco Goes to the Spa - Singer Model 3...  
MODEL 221;    • Saving LaLa, a Singer 221 Featherweig...