The white Gibson guitar has been bought and this morning I remembered this:

In 1983 (give or take a couple of years…) my band played at a club in Manhattan and after soundcheck I wanted to change strings. Even though I had been playing the guitar for a while I had never looked at the machine heads very closely, but that day the light must have been such that the lines of the crank showed up very defined.

…and to my amazement I found that each tuner had a built in crank that could be flipped out and used to tighten new strings! I thought that was the height of luxury! The photo shows the cranks flipped open, but they completely disappear inside each machine head…