This idea was in Family Fun magazine first. Here’s our version.

It’s one threaded steel rod with a nut at the bottom for a stop. There are 15 washers on the rod, that rest at the bottom. When you push the washers up the rod and let go…

They make music as they slide back down the rod.

Here’s how we hung ours on the tree.

The eye hook is attached to the threaded rod via a nut-like connector piece, which you can just see in the bottom of this picture. I don’t know technical terms for hardware, so you probably shouldn’t ask the people at Home Depot for a “nut-like connector piece”.