OK, I've been enjoying this but now stuck and have been for a while, here is a picture of the stage https://s33.postimg.cc/ur0c4bfn3/stuck_stage.png ...the problem is the ramp on the right if wired through the resistor and the other ramp moves correctly up to 1/3 but the ramp on the left I can only get to lower all the way (wired on it's own) or 1/3 down wired through the resistor......any help much appriciated with this level.