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Watch That Last Coil-end When Fiting A New Spring Guide To A Used Spring.

Discussion in 'Technical' started by Sisuphos, Jun 29, 2020.

  1. Sisuphos

    Sisuphos Member

    Likes Received:
    I took my spring air rifle apart to check on the piston seal and spring, when i noticed that the plastic spring guide fit more snuggly in one end of the spring than the other.
    Back when I fitted the new spring to the guide it was not a particularly tight fit on either spring end. Firing a few hundred pellets seemed to have made the spring coil diameter fit the guide more tightly!
    But, on closer inspection this was not the case, I noticed the end of the spring had collapsed inwards a little bit, grabing onto the surface of the guide at a small point of the guide's length, the diameter of the coils further up the spring, above the coil end was unnaffected and still loose against the spring guide.
    So the point of all his is, when fitting a new guide to a used spring it may only be the coil-end that is giving you that seemingly snug fit, while the coil(s) above it is a larger diameter and loose against the guide.
  2. Nickg

    Nickg Busy Member

    Likes Received:
    Even new springs can be a different size at either end .
  3. El Caro

    El Caro Keyboard Hero

    Likes Received:
    Because of the method of manufacture most coil springs will have the last coil on one end with a slightly smaller inside diameter. A quick whisk inside it with a round file will usually sort the problem:)
    Sisuphos likes this.
  4. GrahamC

    GrahamC Active Member

    Likes Received:
    Indeed, in the process of doing my HW99s and the spring ends needed filing as it was gouging the new plastic guide when trying to fit. This is a new gun by the way:

    Attached Files:

    El Caro likes this.
  5. brk1

    brk1 Busy Member

    Likes Received:
    Your lucky you got a spring that good, yes it certainly wants rubbing right down to get rid of all the rough marks but more than that the very end of that spring tip that is at it's thinnest will cut right into a spring guide, I always polish up the ends of all my springs but more importantly I go around the very tip of the spring and file off any hint of sharpness to that pointed end,basically rounding those shap corners, my first HW 97 actually came with a spring that was just cut, sticking up at an awkward angle, no attempt was made to collapse that top edge to make it sit square with the rest of the spring :mad:

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