Remember records and record players?
Anyone remember this funny little thingee?
RCA introduced this snap-in plastic insert to make the smaller 45 rpm records (with larger middle holes) compatible with the smaller spindle size of a 33⅓ rpm LP record player.
Millions were sold in the 1960s when single records were sold.
This was before Cassette Tapes, or music on a CD, or audio downloads of today!