I have an assembly of a wheel caster that I'm trying to turn into a smart component. It's been a while since I used SolidWorks to this level, but it's not working like I remember. I add the caster to an assembly, I add all of the hardware to mount the caster and make sure it is fully defined. I create the smart component and select all of the fasteners to be included.

Now, when I put the caster assembly into another assembly and activate the smart feature, it DOES bring in all of the fasteners, but it DOES NOT bring the mates over. These casters can be mounted on many different thickness of sheet metal, and each time we have a different thickness we have to manually go through and reapply the mates to each fastener.

Is there something that I'm missing or is this normal behavior?