In case you don´t find one.... you can try Eurocarb Ltd in the Uk http://www.dellorto.co.uk/ , I lost one idle mixture screw of my DHLA 40H and they wanted 25 bucks for one in the US, I bought them from this strore as well as the springs. They replied fast to the e-mails and the product arrived very fast...
Thanks you guys. I did track down Eurocarb and they have them....I won't know for sure till it arrives. They seem very helpful. About $34cdn for 2 screws and springs etc and airmail. Sure hope the others don't rattle loose. Thanks again for offer of help. Velocedoc:if you have some used carb parts let me know.
SO that they don`t get loose, yo can use a mild thread locker on the screws, but I will note recommend it since I haven`t tried. Once I had my carbs tuned, y put some grey gasket maker on top of the screws so that they dont came out due to vibrations of the engine...and so far so good.