Originally Posted by AndyS
Why on earth would you use Loctite?
The washer is a rubber bonded seal (Dowty seal). It is designed to be screwed on, does not have to be torque up to extremes, either.
If you Loctite it and the seal goes again, how do you propose to remove it without heat (on a pressurised cylinder) that's down right bl**dy dangerous!
I agree with Andy Paul......no need for loctite. I've done dozens on the S400 series and only ever needed a bonded washer. If you're at the club on sat bring it along as i have a bonded washer.
P.S had both my cylinders quickfilled for knobman (on here) and they look really good.