Best magnifier to use to inspect wheel bore

Either you wear this or you run the risk of walking around the event looking like the Little Rascals dog because some trickster put a pencil ring on your loupe.

You might be able to look cool with just the right hat on top of it. Maybe a dirty old "Pedal to the Metal" foot through the floorboard hat.

This entire board here is looking for the key to unlocking speed that nobody knows about yet. From you say it sounds like that guy found just that key...headband magnifier.