Algodoo

(e)=>{
scene.my.attraction = scene.my.attraction = 7000
}

What were you trying to accomplish here?

Think about it the mathematical way. You're saying that x = x = 700. We know that x = x, right? Then it would be enough by saying x = 700.

In short, use this:
(e)=>{
scene.my.attraction = 7000
}
On the circle too.

Also, you could make the engine a lot better by at least making the attraction last 45º instead of those roughly 10º

Thank you for the help
The Linkage

But no ,i tested on 45º and 10º
10 is better
Th Linkage

And the script is correct
The Linkage

The script barely works by chance. It is not correct lol
You can try using 120 Hz (Settings - Simulation - crank the slider up to 120) which will give you much more accuracy. Also try 45º and put scene.my.attraction = -7000 on the circle (leave the space between the = and the - or you will get an error) and scene.my.attraction = 7000 and it may have much more torque

My monitor support only 60hz
The Linkage

(e)=>{scene.my.attraction = scene.my.attraction = 7000}
Is the same as
(e)=>{scene.my.attraction = 7000}
So not wrong it was just programmed differently.