notch as most rifles come from the factory. Here is a very heavy trigger pull—heavy because when the trigger is squeezed, the sear in its forward travel against the hammer notch has to cam the hammer back somewhat, before it is clear; it is operating against the full force of the mainspring under tension. Now if we reshape the hammer notch like "B," in Figure 166, so that the sear point and the surface of the notch bearing against it are exactly parallel, and at right angles to a line from the trigger pivot to sear point, our pull is greatly reduced—for in squeezing the trigger we do not increase the pressure of the hammer against it.
The amateur will often make the dangerous mistake illustrated at "C," Figure 166. Beveling the hammer notch in this manner permits the hammer to cam the sear forward until it is clear. Naturally
the gun can be fired with the slightest pressure—and quite often it will fire itself with no pressure at all. The slightest jar may result in accidental discharge.
Going back to "B," Figure 166, it is evident that while reshaping the hammer notch has reduced the pressure required, it has not reduced the length of the pull—in other words, the creep. The first step in accomplishing this consists of polishing both the hammer notch and the point of the sear with a hard Arkansas slip hone as shown in Figure 167. In this polishing a very slight beveling of the hammer notch is permissible, but it should be so little that the eye cannot see it. A jeweler's magnifying glass with a 2 inch focus is indispensable for use in adjusting trigger pull."»—a true perception of the shape of a very small notch is not possible with the naked eye.
Before changing the shape of the hammer notch in the least, however, it is well to polish it with the slip hone and note the effect on the pull. Often this polishing is all that is required, depending on the weight of the hammer spring. Watch the hammer as you squeeze it off; and if the sear is forcing it back a trifle as you squeeze, this will readily be seen as well as felt. In that exent, changing the angle of hammer notch will almost surely be necessary.
For changing the notch, I prefer to use a small file. A 6 inch
Was this article helpful?