Harpo harp trolley
Several years ago a harpist in Germany became extremely fed up and frustrated by the inadequacies of the harp trolleys that were available. Fortunately for harpists her husband was a home engineer and the head of quality control for BMW cars. He set about designing and making a trolley that would address all the shortcomings that his wife complained about with respect to the other trolleys available.
The aspects that he set out to improve were, weight, steering, ability to cope with various terrains, ease of use on stairs, capability to be drastically smaller when not in use and secure yet easy attachment off the harp to the trolley.
These problems were solved by using aircraft grade aluminium alloy for the structure, large diameter pneumatic wheels, ingenious collapse and lock mechanisms for the frame and platform and a quick release system for the wheels, a large solid non-slip covered platform and quick release nylon webbing straps.