To begin, select a massager that consists of a rubber roller of length three centimeters and diameter 1.6 centimeters, a fork holder, and a three-centimeter long spring of diameter 0.9 centimeters. The roller should also consist of a limit baffle three centimeters long and two centimeters wide, an adjustment splint, a screw, and an acrylic handle measuring 12 centimeters in length and 0.9 centimeters in diameter. To control the force in the Ding's roll method, test the maximum pressure of the massager on the weighing controller.
Ensure the force is about 0.3 newton by adjusting the angle of the limit baffle. Next, ensure the minimum pressure is about 0.08 newton when rolling back. Before treatment, familiarize yourself with the metronome application to control the rolling frequency to 140 rolls per minute, and practice this more than three times to standardize the operation.
