Hi guys,
After I unsuccessfully searched for an answer I decided to try here:
I setup a constraint to mimic a spring and that works fine - the stone moves up and down as it would be attached the a spring and eventually comes to a stop.
However if I increase the mass either by using the mass scale or a physic material the spring behaves exactly the same while I would expect that for a much heavier stone, the spring would stretch more and the stone would go lower down.
So basically it seems that the mass has no effect on the spring constrain which I’m pretty sure it’s just me that didn’t setup it the simulation correctly.