Create the Joint between the Arm and Crank

1. Click the heading for Part 3 in the browser (tree view) to select the crank. Then, click  View Navigate Zoom Selected (or the equivalent Navigation Bar command) to tightly enclose the crank within the display area. It does not matter if the crank is off-screen when it is selected.
2. With the  Selection Shape Circle and  Selection Select Surfaces commands still active, draw a circle enclosing the hole where the arm and crank meet, as shown in the following image.
   
3. Select  Mesh CAD Additions Joint and click OK to add the pin joint, which appears as shown in the following image.  
   

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