Still, still, still, searching for an anticlockwise BTH magneto, as used on 1931-1933 single downtube framed Flying Squirrels, Reynolds Specials, Dirt-Track (Speedway) models, and 1930 Sprint Specials. These have the mag driven off the clutch drum, so are the other way round to most Scott mags. Just to confirm the rotation, when viewed at the sprocket end of the mag, it turns anticlockwise. I have lots of parts, mostly suitable for 1927 to about 1933 three-speeders if preferred to cash.
Brian (contact details as listed in Yowl under Section Information).