737NG Overhead switch rubbers
This has been bugging me for a little while...
On the 737NG overhead, some of the toggle switches have red rubber rings inside the switch mechanism, that you can see. A great example is the L an R RECIRC fan switches on the AIR CON panel, one has a red seat in the switch, and one does not. The Landing Light switches don't have them, yet the strobes do. So does the CVR toggle switch.
Why do some have them, and some don't? I shall provide a picture on wednesday if people don't follow what I mean - appreciate any feedback!
Horgy