Hello everyone! I just bought a Burlington 5 step steam whistle that's missing the arm. The whistle has a dual fulcrum. I realize the upper length of the arm probably differed on different engines but attachment to the fulcrum and it's ability to operate the valve didn't. Can anyone supply me with the measurements/diagram of a Burlington arm so I can fabricate one? Also, if anyone can tell me if Nathan or whomever made the whistles, I would appreciate the information.