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Adjustable Case Springs

The Harstrom Adjustable Case Spring shown in Fig. 49 is easily fitted and is said to be a very excellent spring. The holder should be fitted securely in a vice and with a three cornered file cut down near the rear end on the back of the spring enough to rest a punch against; then with a tap of a hammer you can move it backwards. To move it forward, rest your punch against the end of the spring. Thus you can easily make it correspond with the screw hole in the case. Then, near to where it protrudes from the holder, bend the spring upward enough to make the front end level with the upper edge of holder, or move, if greater strength is required.