Custom clock wall hook

I printed a custom clock but had no hook to get it on the wall.
So I designed one by myself and superglued it to the backside.
The height is 18mm. I used this clockwork: (https://smile.amazon.de/gp/product/B001OJ2GDK/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1)