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This demonstration was done in Pro desktop 2000 as a test animation. Due to the pathetic rendering engines available, this size and format (.avi) is the only one Anthony could reasonably consider. Originally 60% bigger, a gif file just does not decode fast enough in Microsoft internet Explorer. If you think a frame is missing. It isn't. It's just the defunct decompresser. Assuming you see the animation properly, you will notice that the input shaft is on the upper left. The delivery shaft does not rotate at a constant velocity. This is the reason for using pairs of universal joints on a model. If two are used, a so called constant velocity joint allows the input and output shaft to rotate at a constant velocity. The universal shown here is also at almost the limit of angle a universal can be taken. (around 70 degrees).