The difference between counterweight and traction trebuchets is what force they use. Rope locks are cam-actuated devices through which a counterweight system operating line passes. The superiority of the counterweight trebuchet was not clear cut. Other magnetic compasses have a small sliding counterweight installed on the needle itself. The weight of the car is balanced by a counterweight. The stage had an existing rope counterweight fly system. The official accident report detailed the failure of a counterweight on the constant speed propeller. A revived Germany would be a counterweight to France and a deterrent to Bolshevik Russia. The elevator was belt-driven and used a counterweight for extra power. Phobos also could be a good counterweight for a space elevator. This mass measuring device can also work without a counterweight. Almost every design includes a base station, a cable, climbers, and a counterweight. The small party acted as a minor counterweight to the Liberal Party of New York. The sultans sought British support as a counterweight to Siamese influence. They have been largely supplanted by counterweight fly systems.