Mold apparatus (406) includes a first pivot arm (431) having a first mold surface (441), a second pivot arm (432) having a second mold surface (443) opposing the first mold surface, and a driving cam member (433) having a first driving cam surface (523) configured to engage a first driven cam surface of the first arm to pivot the first arm in a first direction, and a second driving cam surface (524) configured to engage a second driven cam surface of the second arm to pivot the second arm in a second direction opposite the first direction. The driving cam member moves between a first position, in which the first mold surface of the first arm and the second mold surface of the second arm form a continuous mold surface, and a second position, in which the first arm and the second arm are separated to enable removal of a molded element having an undercut mold surface contour.
