sling shot with the help of Line Renderer

Hi,
I am currently working on a physics based game in which sling shot is required. As there is no rubber property for the Unity, I have no idea how to make a sling shot.

I thought of doing it with the line renderer but don’t know how to proceed .

Help?

How are you controlling the slingshot? Are you using the mouse to drag it back or using arrow keys or a moving power indicator or… what?

I want to drag the holder of the spring through finger touch.

use a physics spring joint

I have done that and able to make a spring using line renderer and spring joint(configurable joint can be used ).