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I don't exactly understand what you mean by "lump." Pictures may help.
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put a Tank Tread sprocket on its side. that is the height of the end of our track. we are unable to get the cubes over it to get them on the track.
a few good ideas in there - tempted by the lever and definitely going to use the smaller wheel.
or would it work to put a metal plate on the other side of the cube firmly against it and just roll it against that? anyone know?
also, if you put a large gear on a servo with a small gear meshed to it, will the smallgear be able to turn something 360?