Yes, 45 RPM players had wider pegs and smaller plates and were designed for playing 7" 45 RPM singles. The adapter allows a 7" 45 with the wider peg to be played on a standard size LP plate, assuming the player had a 45 RPM play speed setting (most players eventually included 33/45/78 speed; from what I understand it’s really only the very oldest or specialty players that didn’t).
i had the spindle adapter to put on a stack of 45s, and also a simple disc that fit down it and just allowed one to sit on the turntable at a time. i didnt’ need to use these snap-in adapters.
Yes, 45 RPM players had wider pegs and smaller plates and were designed for playing 7" 45 RPM singles. The adapter allows a 7" 45 with the wider peg to be played on a standard size LP plate, assuming the player had a 45 RPM play speed setting (most players eventually included 33/45/78 speed; from what I understand it’s really only the very oldest or specialty players that didn’t).
i had the spindle adapter to put on a stack of 45s, and also a simple disc that fit down it and just allowed one to sit on the turntable at a time. i didnt’ need to use these snap-in adapters.