| Hello Periscope, I think it is an O ring seal behind the screwed on plate in the end bulk head, much like New To Trains has stated in his post. This should be fine and should keep the water out as stated above, a little of the correct grease liberally applied will keep friction down, but use the correct grease ( rubber grease is best ) as ordinary grease will affect and damage the rubber O ring.
You could always modify the bulk head to encompass a bellows on the outside too if you wanted a belt and braces approach .
Cheers Sub |