Picture hook to calendar hook

I have used brass picture hooks to hold calendars on my wall and these are fine if you use a calendar with a metal hoop and wire at the top. However most of my newer calendars have been the paper variety with a small hole punched through. I was fed up of these getting ripped every time I changed the month showing.
So I designed this simple clip to slot over the picture hook. Attach to calendar and then place on wall. Simple to use and quick to print!