Apparatus, comprising: a tissue-engaging element having a distal portion configured to engage at least a first portion of tissue of a patient, and having a proximal portion ; an implant comprising: a rotatable structure ; at least one flexible longitudinal member having a first portion thereof that is in contact with the rotatable structure , and a second portion thereof that is configured to be coupled to a second portion of tissue of the patient, wherein, during rotation of the rotatable structure in a first rotational direction, successive portions of the flexible longitudinal member advance in a first advancement direction with respect to the rotatable structure and contact the rotatable structure , and, pull the second portion of the flexible longitudinal member toward the implant , and responsively, to draw the first and second portions of tissue toward each other; characterized by at least one docking station coupled to the proximal portion of the tissue-engaging element , the at least one docking station being configured to be coupled to the implant ; and at least one guide member reversibly coupled to the at least one docking station , the at least one guide member being configured for facilitating slidable advancement of the at least one implant toward the tissue-engaging element . a tissue-engaging element having a distal portion configured to engage at least a first portion of tissue of a patient, and having a proximal portion ; an implant comprising: a rotatable structure ; at least one flexible longitudinal member having a first portion thereof that is in contact with the rotatable structure , and a second portion thereof that is configured to be coupled to a second portion of tissue of the patient, wherein, during rotation of the rotatable structure in a first rotational direction, successive portions of the flexible longitudinal member advance in a first advancement direction with respect to the rotatable structure and contact the rotatable structure , and, pull the second portion of the flexible longitudinal member toward the implant , and responsively, to draw the first and second portions of tissue toward each other; characterized by at least one docking station coupled to the proximal portion of the tissue-engaging element , the at least one docking station being configured to be coupled to the implant ; and at least one guide member reversibly coupled to the at least one docking station , the at least one guide member being configured for facilitating slidable advancement of the at least one implant toward the tissue-engaging element . at least one flexible longitudinal member having a first portion thereof that is in contact with the rotatable structure , and a second portion thereof that is configured to be coupled to a second portion of tissue of the patient, wherein, during rotation of the rotatable structure in a first rotational direction, successive portions of the flexible longitudinal member advance in a first advancement direction with respect to the rotatable structure and contact the rotatable structure , and, pull the second portion of the flexible longitudinal member toward the implant , and responsively, to draw the first and second portions of tissue toward each other; characterized by at least one docking station coupled to the proximal portion of the tissue-engaging element , the at least one docking station being configured to be coupled to the implant ; and at least one guide member reversibly coupled to the at least one docking station , the at least one guide member being configured for facilitating slidable advancement of the at least one implant toward the tissue-engaging element . <EOS>