【Summary Description】As stated in the Notice of the General Office of the State Administration of Market Supervision on Carrying out Special Investigation and Treatment of Hidden Safety Hazards of Elevator Drum Brakes (Special Letter of the Municipal Administration of Market Supervision (2021) 564) issued by the General Office of the State Administration of Market Supervision on April 9, 2021 "2. Replace the brake release ejector pin of the drum brake. For the problem that the brake release ejector pin of the drum brake using iron and other magnetic conductive materials swings under the action of electromagnetic force, which is easy to cause brake jamming, replace the brake release ejector pin of the drum brake using iron and other magnetic conductive materials with copper and other non magnetic conductive materials.". Our explanation is as follows: