Install Slatted Beams on Support Structure

What happens here

After the protective coating has been applied and dried, the builder carries one of the completed slatted beams towards the main outdoor structure. With careful handling, he lifts the long, heavy beam and positions it precisely on top of a vertical wooden support post that forms part of the pergola framework. The beam is aligned to integrate seamlessly with any existing overhead structure, completing a section of the slatted pergola top. Final fastening (e.g., with screws or bolts) would secure the beam in place, though this is not explicitly shown.

Goal: Securely mount the finished slatted beams onto the vertical support posts of the pergola or outdoor structure.