How to install QBH请务必确认已经锁紧，请按照下列视频检查，并做缠绕保护 Please make sure it is locked. Please check it according to the following video and do winding protection. 请务必确认已经锁紧，请按照下列视频检查，并做缠绕保护 Please make sure it is locked. Please check it according to the following video and do winding protection. |