An embodiment includes a system comprising: first and second conduits respectively including first and second barbed rods； first and second shafts； wherein: (a)(i) in a first configuration the first shaft slides distally within the first conduit and couples to a proximal end of the first barbed rod, and (a)(ii) in a second configuration the first shaft slides distally within the first conduit and pushes the first barbed rod out of the first conduit； wherein: (a)(i) in an additional first configuration the second shaft slides distally within the second conduit and couples to a proximal end of the second barbed rod, and (a)(ii) in an additional second configuration the second shaft slides distally within the second conduit and pushes the second barbed rod out of the second conduit. Other embodiments are described.
