mmmmm i like this its kinda the sam as a swash drive where the circle is thicker at one side than the other so it makes the arm bar go up and down 4/5 mm i bet .. i bet it was amazing to watch ........this is such a cool idea to soften up a rotary .......but why i ask myself a rotary is made to hit hard an perfectly straight why soften it mmmmmmmmmm.....nothing like the solid punch of a rotary machine gives me ................goose bumps