An apparatus for supporting a payload includes a first support member coupled to the payload and a flexible member configured to be electrically coupled to the first support member and the payload. The payload is configured to rotate around a first rotational axis relative to the first support member. The flexible member is configured to (i) wind around a portion of the first support member or the payload when the payload is rotated in a first direction around the first rotational axis, and (ii) unwind from around the portion when the first support member is rotated in a second direction opposite the first direction around the first rotational axis. The flexible member is configured to transmit sensor data indicating a spatial disposition of the payload or the first support member.