**Preface**: I am completely unskilled and I ask my apologizes to everyone, but this question is for my students. I have not found an animated `.gif` or animations on the web that explains *simple harmonic motion* with the record player.

I don't know how to create an **animated peg** (pink arrow) that by rotating creates its shadow (little downarrow) on a panel (brown right arrow) where the velocity in *O* is the maximum and the velocity is at the point in *+ A* (or in *-A*) zero.

[![enter image description here](https://i.stack.imgur.com/O4dBT.png)](https://i.stack.imgur.com/O4dBT.png)