Hi dwayne, thank you! that was the issue indeed.
i wasnt aware one object needs to be passive, ..im not 100% sure why one object needs to be passive(or that we need more than 1 object at all, for that matter), from my pov, it’s just 2 mesh dangling from the empty, kinda like this… same as in the next lesson, hinge rigid body, if the hinge rotates around the empty, what do we need the cylinder for? but nope, the second i delete the cylinder and start the sim, it all falls down again. so weird, guess it’s a blender thing