Looking for automatic coop opener

[Kaley]

I'm considering getting one, but they are expensive so I figured that I'd ask around to see if anyone had an extra/used one.

 

[Angelbirdy]

I don’t know about a used one, but we saw this thread in this group on making a simple and cheap one using a retracting car antenna and a few other parts.We are presenting the parts for this DIY project. It seems fairly straightforward and will save maybe $70!
https://www.backyardchickens.com/articles/automatic-pop-hole-opener.48288/