crush

what kind of crush is used for deer for those who are unfamiliar with the "crush" terminology, its the mechanism that clamps around an animals head to keep them from moving

Would hanging 2 padded gates on opposite sides with rachet holes for tightening one side of the gate to the other thus trapping and Imobalising the deer work.?if it does does anyone have any pictures etc? Would help grately:)

has anyone used a hydrolic crush chute that was made for elk on deer if so how did it work and are there any mods that need to be done ?