Algodoo

I din't know that script code jet.Thanks

Good simplification of your other scene! Only problem is there needs to be limits on spring length, especially when reducing its length. If left button is held too long, the spring explodes and cannot be recovered without reloading the scene.

OOPS! I meant DOWN arrow (not left).

Done. Thanks.

Works well now.

???

It does nothing.

bugsbunny,

Thanks for letting me know.

Did you start the scene, then place the cursor in the center of the smaller pink circle, and then the hinge became visible, and then pressed the up or down arrow, and then the spring length changed? If this doesn't work, then please let me know where it failed.

I don't know what bugsbunny's problem is, but he/she consistently has problems making scenes work. So, I wouldn't worry about his/her comment. The scene works fine.