There was a cradle called the rock and play (it’s been recalled) that had a tiny motor that rocked it. It just pushed a little arm on the ground to rock the device. Ask your friends who had babies before the recall (2019, I think) if they still have this in their attic somewhere.
Rhebala t1_iszlezr wrote
Reply to Motor advice for self-rocking chair? by iridebikes2
There was a cradle called the rock and play (it’s been recalled) that had a tiny motor that rocked it. It just pushed a little arm on the ground to rock the device. Ask your friends who had babies before the recall (2019, I think) if they still have this in their attic somewhere.