FrogStone: When you go up the steps to the lens, are you clicking on the lens when you get to the top? Doing so will cause your view to focus in on whichever piston the lens last connected, and then you should be able to interact with the control to either connect or disconnect the piston.
maryevans: Thank you FrogStone. I have approached the device and am able to move the lever forward. It connected the piston in the view finder. However I annot move the lever across to change the view so that I can connect the other pistons. I have Windows 10 and have had no trouble with this game so far. I have spent ages trying to work this. I have come to the conclusion that it is a glych in the game. Very frustrating! I have now uninstalled the game and will have to start again. Any advice would be welcome.
Are you playing on a Mac or a PC?
What interface are you using? Mouse and Keyboard, or a trackpad?
We can tell you, that rusty in-game tech takes some patience and sometimes a little (sometimes a lot of) repeated manipultaion to get moving the right way.
Before you uninstall next time, please ask for help here, or email support@cyan.com directly.