Wentworth woodhouse throws up another query, this time in the form of an antiquated bathroom basin mechanism.
It has a pop up waste plug which leaks at the rear where the cross shaft emerges from the waste trap. A brass gland nut sits over a brass barrel on the cross shaft. There is a gap between the barrel and bore of the gland nut.
There was some degraded gunk inside the gland nut but not identifiable as any seal material.
Would this kind of seal use graphite cord or similar to pack the void and create a seal. It's not under any pressure other than the exiting water.
There is no O ring groove and I think its pre,manmade material seals.
Any thoughts?