An intraocular lens delivery system includes an injector body having a bore surrounded by an inner wall. The system further includes a plunger configured to fit within the bore. The system also includes a plurality of deflectable members connected to the plunger and configured to contact the inner wall and to be deflected when the plunger is inserted within the bore. The deflectable members center the shaft and, when inserted within the injector body, contribute to producing a predetermined force resisting advancement of the plunger when deflected in the bore.一眼內水晶體遞送系統,其包括一具有一由一內壁所圍繞的孔之注入器本體。該系統進一步包括一被裝配成適配在該孔內的柱塞。該系統亦包括複數個可撓元件,該等可撓元件被連接至該柱塞並且被裝配成當該柱塞被插入在該孔內時接觸該內壁並且被撓曲。該等可撓元件以軸為中心,並且當被插入在該注入器本體內時,當在該孔中被撓曲有助於產生一抵抗該柱塞的推進的預定力。