Hi Everyone, Having a bit, well, alot of trouble trying to design a linkage which does this (A to B in picture below). Arms move from vertical to 45 deg, and slider on each moves up at same time by 30cm. Tried making something up, but its unstable and a little difficult to operate. Tried making a drawing using scissor linkage, only to realise it would not work at all. Any pointers would be extremely useful.