what is the name of the plastic insert on a 45 record
45 rpm adapter A 45 rpm adapter (also 45 rpm record insert, 45 rpm spindle adapter, or 7 inch adapter, the common size of 45 RPM records) is a small plastic or metal insert that goes in the middle of a 45-rpm record so it can be played on the LP or 78 rpm size spindle of a turntable. The adapter could be a small solid circle that fits onto the bottom of the spindle (meaning only one 45 could be played at a time) or a larger adapter that fits over the entire spindle, permitting a stack of 45s to be played.