This will ensure they remain sturdy for the birds to land on. Place the 4-inch PVC cap on the top of the main pipe. Drill a hole in the center of the cap for the nylon rope, which will act as a handle ...

The low-modulus NP-Cu cap provides solder-like compliance during assembly and addresses the key challenges associated with bonding stiff Cu-Cu at the C2S scale. Assembly requires only a low-pressure ...