snaring from a contralateral iliac artery is taught in u s patent application ser no 11 600 655 entitled u2018 stent graft introducer u2019 and the teaching therein is incorporated herein in its entirety as shown in fig1 f the deployment device 100 in then advanced so that the nose cone dilator 102 is proximal of the renal arteries 12 this draws the indwelling guide wire 124 also up into the aorta 10 the sheath 122 of the deployment device 110 is then withdrawn to release the shorter leg 109 of the stent graft 104 this stage is shown in fig1 g as shown in fig1 h the indwelling catheter is withdrawn down into the contra lateral iliac artery 16 and the sheath 122 is withdrawn so that it is distal of the distal end of the side arm 106 while still retaining the distal end of the longer leg 108 as shown in fig1 i a dilator and sheath introducer 130 is advanced over the guide wire 124 in the contra lateral iliac artery 16 and the indwelling catheter 110 and extension arm deployment device are tracked over the guide wire 124 so that the nose cone 132 of the sheath introducer enters the valved aperture 112 and tracks over the guide wire 124 into the side arm 106 until it exits the distal end of the side arm 134 as shown in fig1 j the sheath introducer nose cone 132 is then.