Reasons causedThe bow (bending forward but repeatedly.) While Le ngatamnaeng wangkrit tires ResultSymptoms of muscle pain and back area.Approach to problem solving.The design can be adjusted in degrees, and adjust the size to use.
The cause of the bending (bending, but not bent repeatedly) while playing the position, place the rubber , resulting in symptoms of pain, fear and muscle behind solutions designed to adjust the angle. And scaled to work.
Caused by.Bow (bow bow not but repeatedly). While mark the position put rubber.Result.The symptoms of fear and pain of the muscle behind.The way to solve the problem.Design for the knife can adjust the degree. And the scale in the right job.