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.
1 Stop any activity that you think may be causing your elbow pain and soreness. Depending on the severity of tendon damage, you may have to avoid this activity for weeks to months.  As soon as you notice pain, use ice or cold packs for 10 to 15 minutes at a time, several times a day.