Introduction:
The Singer Featherweight 221 and 221K are iconic antique vintage sewing machines cherished by collectors and enthusiasts worldwide. Renowned for their portability, reliability, and craftsmanship, these machines have stood the test of time. This comprehensive service manual is a valuable resource for anyone looking to maintain, repair, or restore their Singer Featherweight 221/221K sewing machine.

Table of Contents:
1. Introduction to the Singer Featherweight 221/221K
   - A brief history and overview of this iconic sewing machine model.

2. Safety Precautions
   - Essential safety guidelines to ensure safe handling and operation.

3. Machine Overview
   - Detailed descriptions and diagrams of the Singer Featherweight 221/221K's components and features.

4. Maintenance and Lubrication
   - Step-by-step instructions on how to clean, oil, and maintain your sewing machine to keep it in top working condition.

5. Troubleshooting Guide
   - A comprehensive guide to common issues and their solutions, helping you diagnose and fix problems.

6. Threading and Bobbin Winding
   - Clear, illustrated instructions on how to thread the machine and wind bobbins properly.

7. Timing and Tension Adjustment
   - Detailed guidance on adjusting the machine's timing and tension for optimal stitching.

8. Parts Diagram and List
   - Comprehensive diagrams and lists of all components, including part numbers for easy identification and replacement.

9. Disassembly and Assembly
   - Step-by-step instructions for disassembling and reassembling the sewing machine, helpful for deeper repairs and restoration.

10. Electrical Wiring Diagram (if applicable)
    - Wiring diagrams for models with electrical components, aiding in troubleshooting and repairs.

11. Singer Featherweight 221/221K Accessories
    - Information on the various accessories available for these machines, including presser feet and attachments.

12. Restoration Tips (if applicable)
    - Tips and techniques for restoring the machine to its original beauty and functionality.

13. Resources and References
    - Additional references, books, and websites for further information and support.

This Singer Featherweight 221/221K Antique Vintage Sewing Machine Service Manual is an invaluable companion for enthusiasts, collectors, and sewing machine technicians. Whether you want to keep your Featherweight in excellent working condition or embark on a restoration project, this manual provides the knowledge and guidance you need to preserve and enjoy this iconic piece of sewing history.