Al Smith
Mac Daddy
The holder upper thing is called a spring balancer .In design all it is is a giant recoil spring ,actually two much like the recoil spring of a saw engine
We have dozens of them at work . They can be preloaded depending on the weight they have to lift .Some do 3-4 pounds big ones up to 300 pounds .
We have dozens of them at work . They can be preloaded depending on the weight they have to lift .Some do 3-4 pounds big ones up to 300 pounds .
