OK. Hopefully you can make some sense of this, as I don't have your particular product, but something very similar (the parent to DC).
Where to draw the initial circle? Anywhere you want. Click in the drawing. Type in coordinates; such "0,0". Snap to an object; like your $Construction Lines intersection.
Quadrant (alias=qpoint) snaps to the nearest quadrant point (0, 90, 180, and 270 degrees) on a circle, arc, or ellipse. I chose that as an arbitrary starting point.
Once you have the circles placed, activate the "Tangent to Arc or Curve
" tool. "LTC", then "qpoint" in the Command Line. Click on the right side of the inner circle to start the line. Just click on the 6" radius circle, as that line tool is set up to go directly to a tangent point.
Now you'll want to make a Parallel Line to it. Use "LPA" to activate the tool and click on the line. Use "-1" as an offset.
Create the curved section, where the spoke meets the hub. I used "_circle_te" (Circle Tangent to Entities), because the "CTTR" alias doesn't work in my version (no Radius, another BUG). I clicked on the first line, then the circle representing the outside of the hub and gave it a 0.5" radius. I did the same with the parallel line; same radius.
Now you want to Trim those circles and the two lines. Activate "Trim
" or "Object Trim
"; not sure which one you have in the Modify menu. Select the 2 lines and the outer hub circle as cutting edges. You may need to hit "Enter" to finish selecting. Click on the little circles. You should be left with two arcs; one very small. Escape and reactivate the Trim tool. Now select those two arcs and finish selecting. Click on the lines going into the hub. They should be trimmed back to those arcs and look similar to what I drew.
I'll leave it at that for now.