An annulus ring or a constricting cord may be delivered to the vicinity of a cardiac annulus using a set of anchor launchers, with each of the anchor launchers being supported by a respective support arm. An inflatable balloon is disposed between the support arms, and the balloon is configured so that when the balloon is inflated, the balloon will push the support arms away from each other. At least one retainer cord is connected to the support arms and is arranged with respect to the support arms to encompass the balloon and prevent the balloon from slipping out between the support arms.