Finally I can update this thread! Busy with a file and a large steel penny washer last night and made myself a speedo drive washer thing after 6 months of searching the web. Just fitted it and the speedo works a treat. 2 lugs sticking out hold it in place in the hub, 2 more lugs sticking up turn the speedo drive unit. 3 hours work, scowls from the missus but cost me nothing!