Spring mode ----------- When you click with the mouse, if there is a mass nearby, one end of a spring is connected to it. The other end of the spring is connected to the cursor until the mouse button is released. If no mass is nearby when the spring is released, the spring is discarded. The new spring takes on the values of the "Kspr" and "Kdmp" gadgets. The rest length of the spring is equal to the length of the spring when it was created. - Left mouse button adds a spring between two masses while actively affecting the first mass. - Middle mouse button (*) adds a spring between the first mass and the cursor, actively affecting the first mass. The spring is discarded when the mouse button is released. - Right mouse button adds a spring between two masses. The first mass is not affected by the spring until the spring is in place after the mouse is released. Please read the Window Activaton help page concerning middle and right mouse button clicks. ---------------- (*) Users of two button mice may simulate the middle mouse button by pressing the left or right mouse button while holding down any 'alt' key.