Abstract: An endovascular delivery system for delivering a stent graft within a blood vessel. The delivery system includes a guide member configured to carry the stent graft into the blood vessel and a graft cover configured to cover at least a portion of the stent graft as the guide member is inserted into the blood vessel. The stent graft including a first end and a second end, the first end closer to a proximal end of the endovascular delivery system than the second end. The guide member includes a body having an elongated shape and a non-uniform outer periphery. The non-uniform outer periphery is configured to secure a first end of the stem graft in a first position, relative to a deployment location thin the blood vessel, to hold the first end of the stent graft in the first position as the graft cover is retracted to deploy the stent graft.