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I was thinking in increasing the diameter of the cag gear while at the same time decreasing the diameter of the large gear atached to the track gear so the usefull track length stays the same. From your comment it looks like there is a limit on the ratio you can obtain.
Would any other teeth design help? I see triangular teeths being used for gear reductions with factors 3:1 being common.
I am being curious here - the current design with close to two rotations works fine!