Abstract
An annuloplasty structure includes a contracting member. A fastener is configured to receive the contracting member therethrough, the fastener including a housing and a clamping structure disposed therein. The fastener has an open state in which the contracting member can pass through the fastener, and is biased toward assuming a closed state in which the clamping structure clamps onto the contracting member disposed through the fastener. A stop is coupled to the fastener in a manner that maintains the fastener in the open state. A tool includes static and dynamic cutting elements, and is configured to (a) apply tension to the contracting member by pulling the contracting member proximally through the fastener, (b) lock the tension in the contracting member by pulling the stop proximally out from the fastener, and (c) sever the contracting member by moving the dynamic cutting element. Other embodiments are also described.