Replica Singer Featherweight 221 Adjusters Service Manual. This manual is an exact replica of those originally provided to the Singer Sewing Machine Technicians, we have even designed it to have that vintage feel and look. The information it provides is not only informative for knowing all the inner workings of your machine, but will also show you how to service it yourself. We are often asked "What is the difference between the Adjuster's Manual and the Service Manual?" The answer to that is that they are both similar and different. The Adjuster's Manual looks and feels just like the original, whereas the Service Manual was provided to technicians in sheet form so they could add it to their loose leaf Servicing binder (which included information for all the Singer machines they serviced). The technical information is similar in both manuals but they also differ on a few details. The Adjuster's Manual has more electrical information, whereas the Service Manual has more expanded and exploded views of the Featherweight parts. We recommend having both, but they are equally a stand alone guide as well. Whatever you prefer to use to reference and service your machine, whether it be one or the other or both, will be adequately suitable. Topics for the Featherweight Adjuster's Manual Include: Arm Shaft How to adjust shaft end play Belt How to Adjust Belt Tension Bobbin Winder Adjustment and How to Adjust the Tension Bracket Causes of Trouble How To Troubleshoot Problems with the Featherweight 221 Controller Description and Adjustment of the Foot Controller (aka Foot Pedal) Electrical Connections Inspection and Wiring Diagrams Feeding Mechanism How to Adjust & Raise and Lower the Feed Dogs in Throat Plate Slots Hinged Bed Extension How to Remove and Replace Hinged Bed Extension Lubrication How to Lubricate the Machine and Motor Motor Circuits On Which Series 3 Motor Can Be Operated Causes of Trouble How To Remove Motor From Machine How To Disassemble the Motor How to Reassemble and Replace the Motor Singerlight Singerlight Switch Connections What To Do When the Singerlight Fails to Light How To Remove and Replace Light Bulb Stitching Mechanism How To Adjust Clearance Between Rotary Hook and Needle How To Remove and Replace Rotary Sewing Hook New Rotary Sewing Hook How To Remove and Replace Rotary Sewing Hook Shaft New Rotary Sewing Hook Shaft How To Set the Needle Bar at Correct Height How to Time Rotary Sewing Hook Thread Controlling Mechanism How to Regulate Thread Take-Up Spring How to Adjust Tension of Thread Take-Up Spring Throat Plate How to Remove and Replace the Throat Plate