How to undo ring?

[Barking Mat]

Sorry everyone, particularly @mr haynes , far too many beers, last night...

 

[mr haynes]

Sorry everyone, particularly @mr haynes , far too many beers, last night...

 

[Matchless]

You have lived a sheltered Tourist life. Even I’ve heard of that one.



Is the UV light internally or externally applied.

Internal, external is dangerous!

 

[mr haynes]

Update

Ring is off!

Filter tool was tensioned then judicious use of persuader on the legs freed it. Cheeky little bayonet type fitting

Tank is rather ropey looking on inside though

 

[Screwdriver]

Hurrah! Did the earth move?

 

[mr haynes]

If it didn't the blowtorch was coming out!