Gunsmithing - How to Make a New Mainspring for a Ballard Rifle

Published on January 22, 2014
Duration: 6:52

This video details the complex process of fabricating a new mainspring for a vintage Marlin Ballard No. 2 Sporting Rifle. It covers diagnosing misfires caused by a weak spring, disassembling the breech block, and precisely shaping new spring stock from annealed steel. The process includes critical heat treatment steps of hardening and tempering to achieve the correct spring properties and a blue finish, along with safety repairs like deepening the half-cock notch and muzzle recrowning.

Quick Summary

Fabricating a new mainspring for a Marlin Ballard rifle involves cutting annealed spring steel to size, filing it to match the original profile, and performing critical heat treatment. This includes hardening by heating to ~1400°F and quenching, followed by tempering at ~600°F to achieve the necessary flexibility and durability.

Chapters

  1. 00:00Introduction: Ballard Rifle Misfires & Safety Issues
  2. 00:45Breech Block Disassembly & Screw Organization
  3. 01:18Ballard Rifle Design Variations Explained
  4. 02:06Fabricating a New Mainspring from Steel Stock
  5. 03:45Heat Treatment: Hardening & Tempering the Mainspring
  6. 04:58Safety Repair: Modifying the Half-Cock Notch
  7. 05:33Muzzle Recrowning for Accuracy

Frequently Asked Questions

What are the common problems with old Ballard rifles like the Marlin Ballard No. 2?

Older Ballard rifles, especially those from the 1880s, often suffer from weak mainsprings causing misfires. Another common issue is a worn half-cock notch on the hammer, which fails to hold the hammer securely, posing a safety risk of accidental discharge.

How is a new mainspring fabricated for an antique rifle?

Fabricating a new mainspring involves using annealed spring steel stock. The steel is cut to the correct length, marked using layout fluid, and carefully filed to match the original profile's width and taper. Precise heat treatment is then applied.

What are the essential heat treatment steps for a custom-made rifle mainspring?

The process includes hardening by heating the spring to a cherry red (around 1400°F) and quenching it in oil. Subsequently, it's tempered in niter bluing salts at approximately 600°F to reduce brittleness, impart flexibility, and achieve a protective blue finish.

Why is modifying the half-cock notch important after replacing a mainspring?

Deepening or reshaping the half-cock notch on the hammer ensures the trigger mechanism can securely capture the hammer in the half-cock position. This prevents the hammer from accidentally falling forward if bumped or jarred, significantly improving firearm safety.

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