a proximal body having a neck terminating at a free end and a channel extending therethrough;

a distal stem having a proximal portion coupled to the proximal body, a distal portion terminating at a conical end, and a channel extending through the distal stem aligned with the channel of the proximal body;

a plurality of expandable bodies positioned around the distal stem, each expandable body having an inner surface facing toward the distal stem and an outer surface defining an outer diameter; and

an actuation assembly for moving the plurality of expandable bodies, wherein the plurality of expandable bodies have a collapsed configuration and an expanded configuration such that the plurality of expandable bodies expand radially outward away from one another, thereby enlarging the outer diameter;

wherein the actuation assembly includes a ramp body with one or more ramp surfaces configured to engage with one or more corresponding ramp surfaces along the inner surfaces of the expandable bodies;

wherein the ramp body includes a single conical ramp.