RBD Lab 1.3 - Help with rigid bodies breaking when hitting another object

Hello,
I have be working with RBD Lab for a while. I am trying create a ridge body that breaks when it hits another object. But only break when it hits a certain object. Let’s say for example rocks being pushed along and then falling/sliding down into a spinning object that would crush it.

I have looked into the Acetone objects, but that seems to work when the acetone object is animated across the object that needs to break. I am looking for the opposite… i need the breaking object to fall onto another object and break when it hits it.

I have tried glue strength… it works but if the physics are off a bit, the glue animation key framed may be off. I am looking for a more dynamic way to have an object break when it hits a certain object.

Any help would be great!
Thanks