Alyn, Well I can sort of answer your question, I was/am initially reluctant to break the wheel down because it is otherwise perfect in every respect, the hub itself does not show any other signs of being damaged or cracked, it was simply that the bearing cup rotates in the housing, it it not loose in any other way, in other words it is not slopping around in the housing, I use two books when looking for advice on Vincent maintenance and repair, Vincent by Paul Richardson and Know Thy Beast, Eddie Stevens recommended a Locktite repair, albeit 641 as opposed to 638, and Locktite, a seemingly well known and reputable company sell these products for exactly the application I used it for, such luminaries as Norman Walker and Roy the Mechanic also said a Locktite product could fix the problem, so in my book definitely worth a try, I think my container of 638 cost £10.00, well worth a try (twice) in my book, if it doesn't work I have other options as Greg says. It would be very hard to see how the problem I have could end up with the catastrophic failure that Graham suffered, I have not spoken to Graham, but I am sure that he must have been aware that something was very seriously wrong with the rear wheel on that bike long before it failed in such a catastrophic fashion, I have never seen anything quite like it.