Creating a Revolute Joint between two of the same objects

How would one create a revolute joint between two identicle objects if they collide. For example a physics object called "ball" collides with another "ball" object and I want them to stick together with a revolute joint but I'm coding is "When Ball collides with Ball: create revolute joint between Ball and Ball" construct is confused and doesnt make a joint at all.

Try using families. Put the ball into a family then create the joint between the ball and the family.

Try using families. Put the ball into a family then create the joint between the ball and the family.

Unfortunately I have construct free, but I don't see why a family would work any better.

Well it works because C2 sees the objects as two different entities even though they are the same object.

I think it should work. Are you 100% sure it's not triggering a collision event? Or maybe there's something wrong with the rest of the code.