![](https://s3images.coroflot.com/user_files/individual_files/170511_tr7IWSw8TZwME1h87B2jek7XN.jpg)
This little guy's work is to stop the door from hitting the wall when it's opened.
![](https://s3images.coroflot.com/user_files/individual_files/170511_Qwmn_sGgW_2EgKraLJ99hV9hc.jpg)
Its a poor digital sketch but it shows just how Knock works
![](https://s3images.coroflot.com/user_files/individual_files/170511_OXKkrR2h0GeqzHSCpJy3PS2eT.jpg)
This is the model
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