The question does not clarify whether it is the Belt Chakra point or the Belt Chakra of the Eight Chakras. But either way, knocking is not the correct operation to get the appropriate effect. The Belt Vein point is an acupoint on the Foot Shaoyang Gallbladder meridian, positioned at the intersection of the vertical line of the 11th free end of the lateral abdomen and the horizontal line of the umbilicus. It has the effect of regulating menstruation and stopping leucorrhoea (regulating menstruation and reducing abnormally increased leucorrhoea), benefiting the kidneys and strengthening the waist, and is mainly used for treating gynecological diseases such as irregular menstruation, amenorrhea, abnormal leucorrhoea, hernia, lumbago, and pain in the coercive and rib regions. It can be treated with acupuncture or moxibustion by a professional practitioner. The Belt Vein in the meridians is one of the eight odd meridians, originating under the coercive ribs, surrounding the waist for a week, shaped like a belt, with the role of restraining the meridians running longitudinally through the trunk. Its meeting points are Belt Vein, Wushu and Weidao, treating menstrual disorders, abnormalities under the belt, abdominal cramps (body spasms and convulsions due to wind-cold sensations) and pain, and limb impotence and weakness. It is also often used as acupuncture. If the patient experiences discomfort, he should seek medical attention as soon as possible, and should not blindly manipulate the acupuncture points or meridians.