A delivery system for an implant along a tissue wall in a patient, for treatment of a heart valve in a heart chamber of the patient, the system comprising: a first catheter having a proximal and distal end, wherein the first catheter includes a first lumen extending therethrough for passage of a guidewire, wherein the first catheter further includes: a magnetic head disposed along a distal portion thereof, wherein the magnetic head includes magnetic poles oriented laterally relative a longitudinal axis of the first catheter and a guide channel defined therein extending to a side hole adjacent a first magnetic pole, a penetrating guidewire advanceable through a second lumen of the first catheter, wherein the penetrating guidewire has a sharpened distal end to facilitate penetration of tissue, and wherein the second lumen is aligned with the guide channel of the magnetic head; an posterior anchor releasably coupled with the first catheter along the distal portion thereof wherein the anchor is a posterior anchor axially offset from the magnetic head along the longitudinal axis of the first catheter and non-overlapping with the magnetic head; and a bridging element attached to the posterior anchor at one end and attached to the penetrating guidewire at an opposite end such that advancement of the penetrating guidewire through the side hole of the second lumen and across the heart chamber facilitates advancement of the bridging element across the heart chamber. a first catheter having a proximal and distal end, wherein the first catheter includes a first lumen extending therethrough for passage of a guidewire, wherein the first catheter further includes: a magnetic head disposed along a distal portion thereof, wherein the magnetic head includes magnetic poles oriented laterally relative a longitudinal axis of the first catheter and a guide channel defined therein extending to a side hole adjacent a first magnetic pole, a penetrating guidewire advanceable through a second lumen of the first catheter, wherein the penetrating guidewire has a sharpened distal end to facilitate penetration of tissue, and wherein the second lumen is aligned with the guide channel of the magnetic head; a magnetic head disposed along a distal portion thereof, wherein the magnetic head includes magnetic poles oriented laterally relative a longitudinal axis of the first catheter and a guide channel defined therein extending to a side hole adjacent a first magnetic pole, a penetrating guidewire advanceable through a second lumen of the first catheter, wherein the penetrating guidewire has a sharpened distal end to facilitate penetration of tissue, and wherein the second lumen is aligned with the guide channel of the magnetic head; an posterior anchor releasably coupled with the first catheter along the distal portion thereof wherein the anchor is a posterior anchor axially offset from the magnetic head along the longitudinal axis of the first catheter and non-overlapping with the magnetic head; and a bridging element attached to the posterior anchor at one end and attached to the penetrating guidewire at an opposite end such that advancement of the penetrating guidewire through the side hole of the second lumen and across the heart chamber facilitates advancement of the bridging element across the heart chamber.