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Climax F217 16 Tooth Bevel Skew Pinion Gear for use with F509 Ring Gear in 1/16th Scale. A early trial of the Bevel Skew Gears worked in 1/20th Scale. Gear appearance is a bit rough but they do work. See this video: http://www.youtube.com/watch?v=jY44zWPZkxE
A setup drawing of the Ring & Pinion gears may be found here --- https://s3.amazonaws.com/SIMONTON/F509-F217+Gear+Setup.pdf
A 3D pdf drawing illustrating the frame and gears of Climax CN 1551 may be found here --- https://s3.amazonaws.com/SIMONTON/1551.pdf