Paul,
Some of your observations are right - some aint!
1) The speedo had got a retaining plate, but I'm blind and couldn't see it!
(under about 6mm of oily cr@p)
2) it came out with a tug (using pipe wrench)
3) due to work committments, Castle Combe, and the weather here, I havent actually got it out yet.
Everything is now undone, and i'm on nights again tonight and 2moro, then off for 4 days so i hope to find out how tight the aperture is very soon!!!!!!!
