Xray, I took some code from your scene and mixed it into the code
hinge := (readable(owner));
g0 := (entitybygeomid(hinge.geom0));
g1 := (entitybygeomid(hinge.geom1));
bendTarget = math.atan2( - g1.pos(1) + App.mousePos(1), - g1.pos(0) + App.mousePos(0))
can I please use it for my game?