New Reprint of a Singer 221 Featherweight Adjuster's Service Manual

This is not an Operator's Manual, but makes a great companion book the Owner's Manual for advanced repairs and trouble-shooting. 

Very Good Quality Reprint, Photos and Text are Clear and Concise. 

Real Paper Manual, 36 Pages Including Covers. 

Index of Contents:

Arm Shaft
  To Adjust Arm Shaft End Play
Belt
  To Adjust Belt Tension
Bobbin Winder
  To Adjust the Bobbin Winder
  To Adjust Bobbin Winder Tension Bracket
Controller
  Description and Adjustment of Foot Controller
Electrical Connections
  Inspection of Electrical Connections 
  Wiring Diagrams
Feeding Mechanism
  To Adjust Feed Dog In Throat Plate Slots
  To Raise and Lower Feed Dog
Hinged Bed Extenstions
  To Remove and Replace Hinged Bed Extension
Lubrication
  To Lubricate Machine
  To Lubricate Motor
Motor 
  Circuits On Which Series 3 Motor Can Be Operated
  Causes of Trouble
  To Remove Motor From Machine
  To Reassemble and Replace Motor
Singerlight
  Singerlight and Singerlight Switch Connections
  Singerlight Fails to Light
  To Remove and Replace the Bulb
Stitching Mechanism
  To Adjust Clearance Between Rotary Hook and Needle
  To Remove and Replace Rotary Sewing Hook
  New Rotary Sewing Hook
  To Remove and Replace Rotary Sewing Hook Shaft
  New Rotary Sewing Hook Shaft
  To Set Need Bar at Correct Height
  To Set Needle Bar at Correct Height
  To Time Rotary Sewing Hook
Thread Controlling Mechanism
  To Regulate Thread Take-Up Spring
  To Adjust Tension of Thread Take-Up Spring
Throat Plate 
  To Remove and Replace Throat Plate