Lumen-traveling biological interface devices and associated methods and systems are described. The moveable ramp plate is in frictional contact with the arm provides asymmetric frictional damping for the tensioner arm when the arm experiences wind-up and begins to move away from the belt. Each linking member is welded to an adjacent linking member forming a contiguous surface of linking members. A plunger is positioned between the armature and the slide. In a section axially covering the recess of the pendulum mass, the rolling element has a second outer diameter. 05% to 3%, based on the total equivalents of exchangeable cations in the finished media LiX.