Daytona running indefinitely?

[Andad]

Originally Posted by Calatrava r

Most chronograph manufacturers advise not to activate the pushers under water, but I am sure if you look you will find several watches which can be activated under the water per the manufacturer. Rolex does not advise to do so and specifically says they must be screwed down for warranty coverage. The screw down pusher is basically just an O ring which is different from the Rolex crown designs. What anybody can surmise about the screw down pushers is when they are fully screwed down, they create a metallic shell over the seals of the pushers resulting in less water pressure directly on the seals and reduced water intrusion should the seals fail. While the underlying seals in the pushers may by themselves protect up to 100 WR, Rolex, apparently is not comfortable having these seals directly exposed to the WR.

Closing the ‘metallic shell’ as you have put it would not reduce the water pressure on the internal pusher seals.
Isn’t the seal an “o” ring on the pusher stem Bas?