Pawls

I was going to say that because autos have parking pawls to lock the drive shaft, BUT.

All three ratchet pawls (green) push in unison as a key is depressed.

Baitcasting reel users soon discovered that the clicking noise of the pawls provided valuable warning that a fish had taken the live bait, allowing the rod and reel to be left in a rod holder while awaiting a strike by a fish.

Each rotor had a ratchet with 26 teeth and every time a key was pressed, the set of spring-loaded pawls moved forward in unison, trying to engage with a ratchet.

Since there were only three pawls, the fourth rotor never stepped, but could be manually set into one of 26 possible positions.

The clutch drum, lower left, has been removed to expose the pawls and trip projection.