Step 1: Press the C key (Hot-Key) on your keyboard to create a CIRCLE from a center point sketch.

Select the plane that you would like to start sketching on. In this instance we will use the XY plane (the floor).

Step 2: Select the centre point where the red and green line cross over and drag a circle outwards. Enter a dimension of 16mm. Press Enter.

Step 3: Zoom in closer to the circle you created by using the magnifying glass (zoom tool), scroll wheel on a mouse, or two fingers on a trackpad. 

The zoom tool will zoom into wherever the cursor is placed. 

Step 4: Start a new line drawing by pressing the letter L.

Create a new line on the green axis that cuts the circle in half.

Step 5: Start a new line drawing by pressing the letter L.

Start a new line at 90 degrees from the top of the previous line > Enter a dimension of 72mm > Press Enter.

Start another new line drawing by pressing the letter L.

Start a new line at 90 degrees from the bottom of the line drawn in step 4 > Enter a dimension of 72mm > Press Enter.

Step 6: Start a new 2-point circle.

Select the 'Create' drop-down menu > Select 'Circle' > Select '2-point Circle'.

Step 7: Select the end of the first line created in step 5 > Now select the end of the second line created in step 5.

This will create your 2-point circle.

Step 8.1: Start a new line drawing by pressing the letter L.

Start the line from the centre of the top horizontal line. 

Note: As you drag your cursor along the line it will stop as it reaches the centre point.

Step 8.2: Continuing from step 8.1, create a vertical line extending downwards measuring 5mm. Press Enter.

Press Create a second 5mm line extending upwards from the centre of the bottom horizontal line. Press Enter.

Step 9.1: Start a new 3-Point Arc.

Select the 'Create' drop-down menu > Select 'Arc' > Select '3-Point Arc'.

Step 9.2: To create the arc you have to select 3 points...

Point 1: Select the top of the first circle.

Point 2: Select the top of the second circle.

Point 3: Select the bottom of the 5mm vertical line.

Repeat this process from the bottom to create a second arc.

Step 10: Press the E key on your keyboard to enter the EXTRUDE command.

Select the area inside the first circle, inside the arcs, and finally inside the second circle.

Enter a dimension of 2.5mm. Press Enter.

Step 11: Press the A key on your keyboard to enter the APPEARANCE command.

Select anodized aluminium (red) from the list and drag this directly onto the model.

Completing this step now will ensure all copied bodies are made from the same material.

Step 12: Press the C key to create a CIRCLE from a center point sketch > Select the top plane of the object that you have created.

On the left side start a circle where the red and green lines overlap. Enter a dimension of 3mm.

Press C to start a new circle. Move to the right side and wait until you see a small green circle - this indicates the centre-point. Start a circle here and enter a dimension of 3mm.

Step 13: Press the E key on your keyboard to enter the EXTRUDE command.

Select the area inside the two circles you created.

Enter a dimension of -2.5mm. Press Enter.

Note: this should be a minus number and should remove material.

Step 14: Expand the bodies folder (on the left-hand side of the screen) and select 'Body 1'.

Press CTRL+C (copy)

Press CTRL+V (paste)

This will duplicate Body 1.

Mac users press COMMAND+C then COMMAND+V.

Use the arrow pointing sideways to move the second body laterally. Press Enter.

Step 15: Press the C key to create a CIRCLE from a center point sketch > Select the top plane of the duplicate body that you have created.

Select the centre point of the circular holes > Enter a dimension of 5mm > Press Enter.

(Do this for both sides)

Step 16: Press the E key to EXTRUDE.

Select the area in between either hole and the circle you created.

Use the pan tool (hand) to move to the next hole and select the same area on the opposite side...

Enter a dimension of -2.5mm. Press Enter.