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 .