problem with new rigid body constraints

Hi i am testing out the rigid body hinge constraint in 2.43 rc1.

my problem is that the ball will not interact with the bars sticking out of the cylinder.
i thought i was doing everything right.

i would really appreciate help.

here is the blend

screen shot


Hey, lawsonfulton!

I just joined (ctr-J) the two bars to the cylinder, and changed the bounds to “Convex Hull Polytope” and it worked just fine. Good luck!