Back in the ancient world, there were radios built using things called tubes that plugged into sockets and electricity made them glow like light bulbs.
The radio itself plugged into the back end of a dinosaur and another little connection was on the back for an antenna that glued to the dinosaur's nose with pitch from a pine tree.
Many people built these contraptions in large factories, and some really strange people built superhetrodyne radios in their caves they called homes.
Occasionally the hole in the steel chassi that held all the components like tubes and tuning capacitors and dials and string and wires wasn't properly sized for the bolt or rivet that held the assembly together. Rather than sending the chassi back to the herbivor who acted like a punch press for hole rework, a simple reamer was used to enlarge the hole.
And
THAT'S THE WHOLE TRUTH