Resizing a portion of a Dynamic Component

Greetings all! I have been trying to create a better workflow for myself when designing models for my cnc machine. I am creating parts that slot together and I want the slot to automatically adjust to the size of my material thickness. I am having limited success and probably am not using the right search terms to find a solution. I am uploading an example that I have been playing with. What I am needing is how to the vertical width of the dog-bone slot in the center. Any help here is greatly appreciated!
Dynamic Test.skp (1.6 MB)

Dynamic Test - MOD.skp (1.7 MB)
Open DC options window to change the width.

I broke the piece into 3 components to achieve your goal, and hid the lines where they join to make it appear seamless.

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@rwamoore This is perfect! I think I tried everything but that. That totally makes sense now, Thank you!

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