After months of searching, I've found the correct S467/3/L speedometer for spares or repair on eBay! It looks good in the picture!
When it arrives, it's well wrapped in a box, inside 3 jiffy bags with newspaper around the outside. So, as soon as possible, we spin it up on the drill and...nothing happens. Well, the trip works and the odometer would probably have worked if I had bothered to wait...
If you've read the Bantam article, you'll know that I've repaired these before. When I got this one apart, we found the drive pinion spread around the interior like fairy dust. It shown in the pictures, minus all it's teeth.
As luck would have it, I had a Bantam 'D' speedo in the spares box, with it's drive spindle intact. This fitted straight in.
So next, I dismantled the trip/odometer drive (as you have to do, to get the drive spindle in or out) and cleaned up all the dust with a stick of jewellers pegwood, with a cloth swab taped to it. A dose of lighter fuel on the swab cleaned it up beautifully. Reassembled & lubed up it works perfectly.
Next job, number wheels. A similar swab but this time with a weak detergent mix cleans all the oil & grease off those as well.
Then we get on to the morass of goo that covers the movement. More later.