A transmission apparatus includes a drive member, a driven member, and an at least partially flexible transmission coupled to the drive member and the driven member. The flexible transmission is configured to cause movement of the driven member in response to movement of the drive member. The flexible transmission includes a first tension element having a first portion coupled to the drive member, a second portion coupled to the driven member, and an intermediate portion between the first portion and the second portion. The transmission apparatus also includes an adjustment member that engages the intermediate portion of the first tension element. The adjustment member is configured to be adjusted to vary a tension force applied to the first tension element.