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Hi Graham,Yes, the Retlas has quite a kick, in the video you can see it has to be held down to stop it bouncing around. The bouncing also affects the governor – makes it swing when I don’t want it to. I understand your point about the name of the governor. The plans call it a Holts Inertia governor which is the same as the Gardner 0 type. I’d like to know more about the origins of these governors but I can’t find any information about the Holts Inertia or Pendulum governors on the Internet or my books, who was Holts ? I can see the pendulum hanging beneath the Robinsons valve gear in your post so I look forward to a video of the pendulum governor in the new year if you can find one.Meanwhile there is much for me to do, including, • Make up a cooling system.• Make an exhaust system.• Finish the governor properly.• Open up the air intake which is only ¼” at the moment.• Make a sump - it hasn’t got one so I have been placing layers of tissues under the engine to soak up the oil that passes through the engine.• Running in the engine.• Make a smaller electronic ignition timing disc that houses the neodymium magnet and hide it on the crankshaft between the flywheel and main bearing.Andy