to butirfli one end of the key served to make the skate longer or shorter when you flipped it over and adjusted the nut.If I remember correctly most of the girls on my street used to use an old shoelace as a necklace to wear the key.There was also a felt material on the underside of the clamps,I think it was either red or green.I haven’t thought about those skates in many years until I read your posting.
Does anyone remember metal roller skates? Lobster claw-like clamps held the toe of your shoe or sneaker, and those clamps had to be tightened with a large metal key. Us girls wore the key around our neck. A friend and I used to roller skate around our neighborhood and local parks. The friend had an older brother, who took pleasure in taunting us and trying to trip us, by sticking his out his foot, just as we were gliding by. ;(