When installing the holding-down clip, you should tighten is smmetrily and orderly, put forth your steength evenly to avoid strong local stress, which will deform flange and injure enamel surface.

• 安装卡予时，要求对称按顺序拧紧，用力均匀以免局部应力适大，使法兰变形而破坏瓷面。