45 rpm adapter
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A 45 rpm adapter (also 45 rpm record insert, or 45 rpm spindle adapter) is a small plastic insert that goes in the middle of a 45-rpm record so it will play on 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.
[edit] The "Spider"
The former RCA Corporation tailored to the smaller spindle size of an LP record player with a plastic insert known as a "spider". These snap-in inserts allowed a 45 rpm record to be played on a 33 1/3 rpm record player. Commissioned by RCA president David Sarnoff and invented by Thomas Hutchison, "spiders" were prevalent in the 1960s and sold tens of millions per year.
