I parented a camera to a rivet. Now I want to switch it to another rivet during animation but it doesn't work. Is there an alternative setup for this?

The switcher is slightly misleading in that it is specifically for switching between cameras, not transforms.

http://localhost:48626/nodes/obj/switcher [localhost]

There are a number of ways to do what you want though. In the attached file I through together three different setups.

The first makes use of the Switcher object as it is intended to be used. I create a camera and make a reference copy of it so you only have to manage one camera. These are both connected to the nulls/rivets then fed into the switcher. You can then animate the Switch Camera parameter.

The second is more like yours, but it uses a blend to switch between the two. The weight for the 2nd input is 1-weight1, so if you switch weight1 to 0, weight2 goes to 1. You would want to use a constant animation function to get it to switch instantly.

The third way uses CHOPs. There are just two Object Chops and a switch to select which one. The chosen transforms are then exported to the camera.

Hope that helps.

Thanks it works now.