1. First find the deformed position of the steel ring, install the steel ring on the fixture, and use the calibration dial to find the deformed position for calibration.

2. Secondly, locally heat the deformed part with a blowtorch. The little red dot on the steel ring is an infrared thermometer, which can stop heating when it reaches a certain temperature.

3. Finally, after reaching a certain temperature, the steel ring becomes soft, and it is fine-tuned repeatedly with a small hydraulic jack to reach a reasonable standard.