In this step we will draw two concentric circles and then extrude them to model the circular tube that sits at the base plate.

1.Select the Top View to activate it.

2.From the View Toolbar drop down the Display menu and select Wireframe Display.  This will allow us to better see our next drawing.

3.Now from the Curve Modeling tab select the Circle on Point command again.

4.For the center point select the grid point at 0,0 center of the drawing.

5.Now for the circle diameter you can select the grid point shown below or type in 3 and press <Enter>.  A circle 3" in diameter is drawn.

6.Now repeat the command, this time drawing a circle with a diameter of 2.5" in diameter.

7.Once the two concentric circles are drawn, select them both.  You can window select them or while holding down the <Ctrl> key, just pick both of them.

8.With the two circles selected, go to the Mesh Modeling tab and select the Extrude command again.

9.Now move the cursor to the Front View and select the grid point located at 3" in the positive Z direction as shown below.

10.The center tube is now created and shown in each window.

11.Save your work by selecting the Save icon from the Quick Access Toolbar.

12.Activate the Right View by selecting anywhere on the grid.

13.From the View Toolbar, drop down the Display menu and select Wireframe Display.  Again, this will allow us to better see our next drawing.

14.From the Curve Modeling tab, select the Circle on Pt command again.

15.For the center point of the circle, select the grid point shown below.

16.Now for the circle diameter you can select the grid point shown below or enter 1.0 for the diameter.

17.Now select the circle you just created, then go to the Mesh Modeling tab and select the Extrude command again.

18.For the length of the cylinder move the cursor over to the Front View and select the grid point shown below.

19.Now select the cylinder and toggle the display of the Graphic Manipulator on.  This toggle icon is located on the Status Bar at bottom of the display.

20.With the cylinder selected pick on the red X axis of the Graphic Manipulator to display the input box and enter -2.25 and press <Enter> as shown below.

21.You can toggle the Graphic Manipulator off.

22.From the Mesh Modeling tab, select the Subtract command .  It's located in the Edit Meshes pane.  We are going to Subtract the cylinder from the tube.

23.For the first mesh select the tube.

24.For the second mesh select the cylinder.  The hole is created in both sides of the tube.