Originally Posted by SPR
In that case check tightness of the cylinder often! my cylinder unscrewed completely, and because it's inside I never noticed, till I went for a swim of my tender... this is reason they now glue these on as complete units.
To be clear, it's the Hammar ones that are glued. The UML / Halkey-Roberts types with the cylinder on the outside are not glued. I understand that manufacturer advice is that they shouldn't be, presumable in case it damages the plastic housing.