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This increases tension on the main spring as the blade and ideal spring carrier are locked. A ramp on the slide impinges on the lower pin. When the pin leaves the notch the blade and right spring provider are free to move. The right spring carrier moves just a brief distance prior to it comes to rest in the slide.

Another limiting pin at position 3 suits a notch and locks the blade in the prolonged position. A tab on the left spring provider suits a hole in the blade at position 4 which restrains the left spring provider. This permits reverse force on the thumb stud to increase stress in the main spring before the upper restraining pin releases and the blade and provider can return to the closed position.

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The entire slide assembly moves only a short distance, exactly as far as the thumb stud relocations. The force that triggers the blade to extend or retract amounts to the force used by the user on the thumb stud to extend the main spring before it launches. For I Found This Interesting of the blade is not likely to even break skin and is entirely incapable of causing substantial injury when launched though the edge of the blade might still cut as it moves similar to any knife.

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This is quickly treated by either pulling the blade out so that it locks or pressing it in till it locks and after that redeploying. Double-action knives have the benefits of having the ability to immediately pull back the blade, in addition to allowing the main spring to be in the "at rest" position whenever the knife is fully open or closed.

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Single action OTF knives [modify] Schematic of single action out the front automated knife. A single action out the front knife runs under similar principles but will just automatically extend the blade which must then be manually pulled back. One spring post (green, left) is rigidly repaired to the manage (orange), the other spring post (green, ideal) is fastened to the base of the blade.