each person had a strap with two buckles like this that the guides operated
File: IMG_4339.JPG File size: 3,799KB Image Serial Number: 000-4339 Camera Model: Canon EOS 40D Firmware: Digital Photo Professional Date/Time: 2008:03:29 16:22:10 Shutter speed: 1/400 sec Aperture: 5 Exposure mode: Av Flash: Off ISO: 320 Focal length: 21mm Image size: 2592 x 3888 Rotation: none Color space: sRGB Color profile: sRGB v1.31 (Canon) User comments: "each person had a strap with two buckles like this that the guides operated"