To make a simple unbreakable chain, you can do it in 5 easy steps:

1. Make a chain.

2. Right-click on it and set the density to 100kg. If you are going to drop something 100kg on it, change it to 500kg instead.

3. Select the whole thing and right-click on it, bringing up the object menu. Go down to 'Hinges...'

4. Pause it, and set the hinges to a motor. Set the motor strength to '+inf' and motor speed to '0'. You may also want to enable auto-brake, which is below the motor speed.

5. Test it by dropping something heavy on it. If it doesn't stretch, then GOOD JOB!!

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Have Phun!! --Physicsguy 20:26, 30 November 2008 (UTC)