Here is a video of a rock functioning as a spring to close a gate. Watch the rock go up and down (just left of center) to pull the gate closed. (Patience may be needed while it loads!)
Two retirees traveling the world!
Here is a video of a rock functioning as a spring to close a gate. Watch the rock go up and down (just left of center) to pull the gate closed. (Patience may be needed while it loads!)