In this step we need to make a few modifications to the top access.  The first is an extruded cut at the back of the access.  The second is a revolved cut.

1.Activate the .

2.From the tab select the Rounded Rectangle command.

3.For the first and second corners of the rectangle select the grid points shown below.

4.For the corner radius, enter 0.125 in the command window and press <Enter>.

5.Now select the rectangle and from the tab select the Extrude Mesh command.

6.Move to the and drag the extrude length to 1.750".

7.Now go to the tab and select the Subtract Mesh command again.

8.For the first mesh solid select the body.  For the second mesh solid select the extrusion.

9.For the second modification, got to the and from the tab select the Rectangle command.

10.Select the two corner grid points shown below.

11.Now we need to fillet one of the corners.  From the tab select the Fillet Curve command.

12.In the command prompt enter 0.125 for the fillet radius and press <Enter>.

13.Now select the top and left side of the rectangle to fillet the upper left corner as shown below.

14.We need to revolve this, so select the closed rectangular profile, go to the tab and select the Revolve Mesh command.

15.For the axis of revolution, select the two grid points shown below.

16.Now subtract the revolve from the body.  From the tab select the Subtract Mesh command.

17.For the first mesh solid select the body and for the second select the revolve.