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.
Full Text (Achilles Tendonitis) Exercises to Avoid. Excessive stretching is not good for your Achilles tendon. The stretch that I most often recommend is the âwall stretchâ. I do not recommend the âstair stretchâ, the âincline stretchâ, or the âput a towel around your feet and pull up until it hurts stretchâ.