About an inexpensive DIY flock box.
Here is a video that shows, close up and personal, how it works.
[embedyt] https://www.youtube.com/watch?v=dAI5VzirB7s[/embedyt]
And here is information about how it can be used.
[embedyt] https://www.youtube.com/embed?listType=playlist&list=PLLYkOTQM-OSX0w38NT8b9lBlAqx5Gfbja&layout=gallery[/embedyt]