does anyone have a pneumatic diagram for opposing cylinders??

[cmassey]

we are trying to use two opposing cylinders but they keep going after you let go of the button on our prototype. can anyone help us?

[MrForbes]

Hi, I'd like to help, but I have no idea what you have built. If you can make a sketch, take some pictures, or give a detailed description, it would make the helping job a lot easier.