use of an additional magnet 480 in the left atrium 12 for supplying additional magnetic force at the junction of the annulus 40 and cs 46 an arrangement of magnets 480 482 484 may be used for temporarily locking up the catheter system at the location that it is desired to deliver a fastener or anchor not shown such as in those manners previously described fig4 b 40d illustrate an alternative fastener delivery system and method for delivering fasteners 486 in the left atrium 12 as opposed to the left ventricle 14 as previously described this system is otherwise similar in that magnetic guidance and lock up first temporarily occurs between the various magnets 480 482 484 in the system once this magnetic lock up has taken place a fastener 486 and flexible tensile member 488 may be delivered through a steerable portion 490 a of a catheter 490 in the left atrium 12 such that the fastener 486 is delivered into the left ventricle 14 steering mechanisms such as those described elsewhere herein may be used to accurately direct catheter portion 490 a a number of fasteners 486 and attached flexible tensile member or members 488 may be deployed as shown in fig4 d and then.