Dear Dave,
Welcome to the Douglas fraternity, I hope you really enjoy your Dragonfly.
Firstly an advert, you should join the London Douglas Club, we have members all over the world, not too sure about Brittany.
Full details can be found on the Club website douglasmcc.co.uk
The Club do sell reprinted Douglas manuals and are very shortly intending to publish a rewritten spares book in which we have amended some errors and added diagrams and details of later in production upgrades that Douglas never published.
I for my sins seem to have inherited this job, should you be interested in purchasing the manual it costs £8-00 plus p&p, the spares book will be in the same price range depending on printing costs.
Please email me via my address here on this site should you wish to buy a copy.
Incidently the Club does hold a large stock of Dragonfly spares, however, sale of these are restricted to members only. The Club mag also carries technical articles.
Should you be attending the Montlery event next weekend keep an eye out for us we will probably be with or close to the Brooklands group, I will have a 1929 OHV so should be easy to spot.
Cheers for now.
Dave