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a balance that measure weight by the tension on a helical spring
Increase the tension on the spring
Serepentine bels do not have tension adjustments, there is a tension pully That is preloaded with a coil spring in it. If the belt is loose, the pully spring may have lost it tension. Replace the pully assembley.
A spring scale measures forces, such as weight or tension.
Spring rubbers won't work?
A spring scale measures forces, such as weight or tension.
When a coil spring is compressed the spring compression tends to vary inversely with the length of the spring to the point where the spring cannot be compressed further without damage. In tension, the spring tension varies directly with the length but only so long as the elastic modulus is not reached. At that length, the spring becomes permanently deformed or "sprung". Depending on the representation of the drawing, the vector of the spring in compression will be opposite that of the same spring in tension. That is to say, if you push the spring to the left the force will be negative while a pull to the right will be positive so the spring in compression will push right (positive) and the spring in tension will pull left (negative).
Any spring that is left under tension will gradually lose its springiness, due to metal fatigue.
setscrew
Are you doing the Globe Saturday crossword as well? Haven't figured it out either. Crossword answer to device to regulate spring tension: setscrew
A watch winder works by twisting gears that are attached to a tension spring. Once the gear is twisted and the spring is at full tension, the watch will properly work.
The tension on a serpentine belt is automatically set by the Idler Tension Pulley. If you find it is not correctly setting the tension, the the spring may be broken.