How to link one model (of only "solid" parts) to a rotation conservation port?

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So I'm trying to design a simple reaction wheel in simscape. I'd like to use the "DC Motor" block, but am unsure how to connect a "solid" block (which has its own inertia) to this motor. I have a very basic 3-D model of a cube-frame (made entirely of solids (inertia determined by geometry), which I'd like to hook up to one end of this mechanical rotation conservation port, and a simple cylinder, which would be hooked up to the other end.
After several hours of googling, I cant find a solution. :(

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Niklas Anthony
Niklas Anthony 2015-7-22
I figured it out. Thanks though. <.<
So, what I ended up doing was hooking one end of a rotational conservation port to "reference or ground" and the other to some inertia "I", which is the calculated inertia of a cylinder, with parameters given in a mask. I use an ideal torque sensor, which I then feed into an external force block attached to the cylinder.

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