Bruce, l did indeed click on the orange rectangle and f, nothing happened, oh poo! Craig, thank you for the information which both fascinates and intrigues me, however l have but one question which is, wait for it, if fitted dry ie no grease or oil on mating surfaces do said gaskets stick and then self destruct or merely separate from said surfaces in one piece? If the latter is the case l can indeed see some of my state pension going to a worthy cause as the arthritic hands are fed up with faffing about with poor fitting gaskets, sealants and my short mental fuse is often in need of a reset after finding oil seeping from whence it should not. Clearly l am not the only person a tad confused by the omega ring, even a google search failed to clear the brain fog that had descended like a cloud before my very eyes. When l made an enquiry with a son who is employed in the motor trade he suggested that perhaps the said ring answer might be found on one of the various adult sights that infest the internet? l have therefore decided to await a definitive answer from ringed of Devonport, over to you monsieur Bowden. Yours cosmetically enlightened of West Wales at an unearthly hour thanks to spring lambing time, oh the joys............