This is the first time I took a hammering action to a piece of machinery with success.
You guys dont hear that clacking noise coming and going? It starts about 45 seconds lfet (as indicated on the Flickr player - it actually counts down, not up). And then when I rev it again at 20 seconds left, the sound is gone till the end of the video.
You should listen to an iron barrel motor to understand how much smoother these UCE's are.