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.
You may need to wear a splint for different lengths of time. 1  If your tendon is only stretched, not torn, it should heal in 4 to 6 weeks if you wear a splint all the time. 2  If your tendon is torn or pulled off the bone, it should heal in 6 to 8 weeks of wearing a splint all the time.