Anvil 065: S&W model 29-2 Trigger stud replacement

Published on May 10, 2021
Duration: 21:09

This video details the complex process of replacing a broken trigger stud on a Smith & Wesson Model 29 revolver. The instructor, with significant experience, guides viewers through diagnosing the failure, which involves a snapped stud and a wallowed frame hole. The procedure includes drilling out the broken piece, custom machining a new stud, threading the frame, and carefully fitting and finishing the new component. Emphasis is placed on maintaining critical dimensions for firearm safety and function, particularly the relationship between the trigger stud, hammer stud, and sear. The instructor highlights the advanced nature of this repair, noting that Smith & Wesson typically handles such work internally.

Quick Summary

Replacing a broken trigger stud on a Smith & Wesson Model 29 is an advanced gunsmithing task. The process involves removing the broken piece, custom machining a new stud, threading the frame, and precisely fitting the new component. Critical dimensions and the spatial relationship between the trigger and hammer studs must be maintained for safety and function, verified by a hammer pushoff test.

Chapters

  1. 00:05Introduction: S&W Model 29
  2. 00:35Identifying the Broken Trigger Stud
  3. 01:49Planning the Repair
  4. 02:02Frame and Stud Anatomy
  5. 03:00Trigger Pin and Cylinder Stop
  6. 03:30Tool Fabrication Strategy
  7. 04:21Centering and Drilling the Stud
  8. 05:09Progressive Hole Enlargement
  9. 05:23Addressing Stud Wobble
  10. 05:36Drilling the Frame
  11. 05:48Removing the Broken Piece
  12. 06:20Engineering the New Stud
  13. 07:06Measuring the Original Stud
  14. 07:33New Stud Diameter Calculations
  15. 08:06Drilled Hole Diameter
  16. 08:17New Stud Design
  17. 09:01Determining Stud Length
  18. 09:48Engineering Change: Threading the Hole
  19. 10:25Final Stud Design
  20. 11:32Test Fitting and Tolerances
  21. 11:54Trigger Stud's Role in Safety
  22. 12:09Finishing the Hole
  23. 12:21Maintaining Spatial Distance
  24. 12:33Demonstration with Triple Lock
  25. 13:02Comparing N-Frame Studs
  26. 13:33Single-Action Cocking Geometry
  27. 14:01Why S&W Doesn't Sell Studs
  28. 14:13Personal Revolver Repair
  29. 14:38Thread Pitch and Loctite Application
  30. 15:06Addressing Side Plate Nicks
  31. 15:30Forming the Stud End
  32. 16:28Final Stud Fit and Finish
  33. 16:43Reassembly
  34. 18:11Hammer Pushoff Test
  35. 19:19Rust Bluing and Test Firing
  36. 19:52Conclusion: Model 29 Trigger Stud Repair

Frequently Asked Questions

What causes a trigger stud to break on a Smith & Wesson Model 29?

A trigger stud on a Smith & Wesson Model 29 can break if it's not adequately supported by the side plate. This lack of support allows for excessive movement, leading to stress fractures and eventual breakage of the stud. The associated hole in the frame and side plate can also become 'wallowed out'.

How is a broken trigger stud replaced on a Smith & Wesson Model 29?

Replacing a broken trigger stud involves drilling out the remaining fragment, creating a custom-machined replacement stud, threading the frame to accept the new stud, and then carefully fitting and finishing it to ensure proper function and safety, including a hammer pushoff test.

What are the critical dimensions for a replacement trigger stud on an S&W Model 29?

The original trigger stud is approximately 0.100 inches in diameter. The replacement stud needs to be precisely sized to fit the frame hole (which may be wallowed out, e.g., to 0.125 inches) and engage correctly with the side plate recess. The speaker made a replacement stud around 0.105 inches.

Why is the spatial relationship between the trigger stud and hammer stud important on an S&W Model 29?

The spatial relationship between the trigger stud and hammer stud is critical for the single-action sear engagement. Maintaining precise distances ensures the correct geometry for cocking and firing, directly impacting trigger pull and overall firearm safety and performance.

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