How To Fix Spring Assisted Knife – The Right Way Guide

How To Fix Spring Assisted Knife

A spring-assisted knife is a convenient tool for many tasks, but when it is not working correctly, it can become a dangerous hazard. It requires a basic knowledge of knife mechanics, a few tools, and patience. Whether your knife has a broken spring, a loose blade, a jammed release button, or something else, it can be fixed.

In this guide, you will find step-by-step instructions on how to safely take apart, clean, and repair your spring-loaded knife.

Types of Assisted Opening Knives

There are several different types of assisted opening knives available on the market.

Butterfly Knives: They also known as balisongs, are folding knives with two counter-rotating handles that can be quickly flipped open. The blades are usually steel and feature a latch to lock the blade in place when open.

Flipper Knives: Flipper knives are a type of assisted-opening knife that uses a tab on the blade’s tang to quickly open the blade when pinched. The tab is usually on the back of the blade and can be used with one hand.

Gravity Knives: Gravity knives feature a blade that is released from the handle when the user applies pressure to the handle, causing the blade to drop out. The blade is then locked in place until pressure is applied to the handle again.

Thumb Hole Knives: Thumb hole knives use a hole in the blade tang to quickly open the blade when pinched. The hole is usually on the back of the blade and can be used with one hand.

Thumb Stud Knives: Thumb stud knives are folding pocket knives that feature a small stud or protrusion near the base of the blade. This stud is used to help open the blade quickly using the thumb.

Signs Of A Damaged Spring Loaded Knife

If you notice that your knife is not opening and closing smoothly, or if the blade does not lock when opened, it may be time to service your knife. Other indications of an issue with the spring mechanism could include difficulty unlocking the blade from its open position, as well as a noticeable decrease in how firmly the blade locks into place when opened. Additionally, if you see a piece of metal sticking out from the handle or any other visible damage, then this could indicate a broken spring.

If you have observed any of these issues with your knife, it is likely time to replace or repair the internal spring components.

How To Fix Spring Assisted Knife: Step-By-Step Guide

Before you begin any repairs, make sure that you are familiar with the knife’s parts, and the safety protocols for handling and repairing it.

  • Step 1: Inspect the knife to identify any broken or worn-out parts. Carefully examine the knife for any visible signs of damage or wear. Look for loose screws, broken springs, or other parts that may have become worn or damaged. Pay special attention to the blade, as this is the most vulnerable part of the knife. Also, check the spring mechanism for any signs of wear or damage. If any parts are broken or worn, they will need to be replaced.
  • Step 2: If necessary, carefully disassemble the knife to access all components. Before attempting to replace any parts, it is important to make sure you have access to all components. For most knives, you will need to carefully disassemble the blade from the handle and remove the spring mechanism. It will require some basic tools, such as a small screwdriver, needle-nose pliers, and possibly a spring bar replacement tool. Make sure to keep track of how all the components fit together, as this will make reassembly easier. Once all the components are accessible, you can begin to replace any broken or worn-out parts.
  • Step 3: Replace any broken or worn-out parts with new ones that match the original parts. If you are confident in your ability to identify the correct parts, you can purchase them from a knife parts store or contact the manufacturer for a replacement part. Otherwise, you should take the knife to a professional to ensure the correct parts are used. Be sure to match the size, shape, and material of the replacement parts to the original parts. This will ensure that the knife operates properly after being repaired.
  • Step 5: Reassemble the knife and make sure the spring is properly installed and tensioned. Be sure to check the blade to ensure it is properly seated and the spring is tensioned correctly.
  • Step 6: Once the knife is reassembled, test it to make sure it operates as intended. Open and close the knife several times to make sure the spring is tensioned properly and the blade opens and closes smoothly. If the knife does not operate properly, then it should be taken to a professional knife repair shop.

Common Problems

Check the Knife Lock: Make sure that the knife is properly locked when open and closed. If it is not locked, the knife may not be functioning correctly.

Check the Spring: Inspect the spring for any signs of wear or damage. If the spring is worn or damaged, it may not be providing enough force to properly operate the mechanism.

Check the Blade: Make sure that the blade is properly aligned with the knife handle and that there is no binding or resistance when opening and closing the knife.

Adjust the Spring: If the knife does not open and close with ease, adjust the spring tension by turning the screw located on the handle. Make sure to not over-tighten the spring.

How To Close A Pocket Knife

How To Close A Pocket Knife

Before you begin, make sure the blade is in the closed position and that your fingers are safely out of the way of the blade.

  1. Locate the thumb stud or blade protrusion on the blade.
  2. Use your thumb or index finger, and press down on the thumb stud or blade protrusion to engage the spring-assisted mechanism.
  3. Once the blade has been engaged, use your other hand to hold the handle of the knife.
  4. Apply pressure to the handle of the knife, while keeping your thumb pressing down on the thumb stud or blade protrusion.
  5. As you apply pressure, the blade will slowly close.
  6. Once the blade is completely closed, release the pressure from the thumb stud or blade protrusion.

You should hear a slight click when the knife is completely shut, indicating the knife is safely closed.


What should I do if my pocket knife won’t open?

If your knife won’t open, you should check for any debris or dirt that may be blocking the blade from opening. Clean the knife and adjust the tension of the spring to ensure it is able to open properly.

How can I tell if the springs need to be replaced?

If the springs are not functioning properly, they will need to be replaced. The springs should be able to be compressed and released easily.

What type of spring should I use for my knife?

The type of spring you should use for your knife depends on the specific model you have. Generally, it is best to use the same type of spring as the one that came with your knife; however, if that spring is not available, you can use a compatible one.

How do I adjust the tension?

To adjust the tension, you will need to loosen the screws that hold the spring in place. Then, use a screwdriver to adjust the tension of the spring until it is at the desired tension.

Final Thoughts

Fixing a spring loaded knife is more than just tightening a few screws. It requires attention to detail and a good understanding of the mechanics of the knife. It is important to pay attention to the condition of the spring, the pivot, and the blade. If there is any damage to any of these components, then the knife should not be used until it is repaired. In some cases, the blade may need to be replaced.

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