I guess it is worth at least once showing the very basics of designing a completely new device. Often you can do this in your head. I do this, usually when I am supposed to be asleep but just can't get a particular problem out of my head. Or many times you can do this directly in your CAD program of choice. But sometimes, and in fact many times, the very starting point is
........................... the rubbish drawings.
I have hundreds of these. Some I come back to again and again, to inform the later design process. Many times, there is no quicker way to decide which cables, cogs and axles are going where, than by just trying to draw it out on paper. So to break the monotony of actually designing the hand in sketchup, I thought I would take a break to share to the utterly ridiculous 'concept' drawings that eventually lead to solid printed items and the many rejected parts I have printed over the last couple of months.