Which modern device operates similarly to a wheel lock mechanism?

The correct choice is the cigarette lighter because it operates on a principle of ignition that is somewhat analogous to the wheel lock mechanism used in early firearms. The wheel lock mechanism involved a spring-loaded wheel that, when turned, created sparks to ignite gunpowder. A modern cigarette lighter utilizes a similar process where a flint is struck by a metal wheel, producing sparks that ignite the fuel to create a flame. This mechanism of generating sparks for ignition connects both devices in their fundamental operation and purpose.

In contrast, other options do not share this ignition mechanism. The matchstick holder refers to a device meant to hold matches, not to produce ignition through mechanical means like sparks. The electric ignition system, although it ignites fuel, relies on an entirely different process, typically involving electrical currents rather than mechanical sparks. The revolver mechanism relates to the firing of rounds through internal mechanical actions and does not create sparks to ignite anything. Hence, the similarity in ignition methods makes the cigarette lighter the most relevant answer here.