Spring washers, sometimes called disc springs, are a subtype of washers. They lend their mechanical capabilities to the unique profile of the material: when subject to a load, the irregularities of the washer compress with a proportionate resistance to return to their predeflected shape.
You should never stretch a pulled muscle to the point of pain or you risk re-injuring it. Do not overstretch the pulled muscles. Too much stretching can retear injured muscle fibers. Gently stretching a pulled muscle may relax the surrounding muscle fibers, which may be tight in response to the injury.
Pull the arm that is sore gently across your chest until you feel a good stretch of the muscles in your shoulder. If pain occurs, don't pull your arm so far across your chest. Hold the stretch position for 10 seconds and release the arm.Repeat this stretching exercise three times.ull the arm that is sore gently across your chest until you feel a good stretch of the muscles in your shoulder. If pain occurs, don't pull your arm so far across your chest. Hold the stretch position for 10 seconds and release the arm. Repeat this stretching exercise three times.