This perch should support all pet birds from small to medium size.
It is designed to accept four suction cups with M4 threads (example).
Find a stick with a rough diameter of 2 cm. Cut it to length using a saw. If it's too large to fit in the hole, use a knife to make the first 2.5 cm thinner until it fits. If it's a bit too thin, you can use tape or some wooden chips to shim it into place. Then use a small screw to secure it.
The author marked this model as their own original creation.