An endoscopic shaft assembly (200) includes: an elongate outer shaft (222)； and an outer housing (212) coupled to a proximal portion (222a) of the elongate outer shaft (222). The outer housing (212) includes: a tubular wall (215) defining a cavity (214)； and a shaft plunger (234) disposed within the cavity (214) and configured to move axially within at least a portion of the cavity (214) along a travel path. The shaft plunger (234) includes a collar (236). The collar (236) configured to be separated from the tubular wall (215) along a first travel portion of the travel path and to contact the tubular wall (215) along a second travel portion of the travel path.
