Idle mix screw O ring

[Scotsman]

I am putting a repair kit on my ADFA32 and am embarrassed that I can't figure which groove on the idle mix screw takes the O ring. Is it the groove immediately above the threads or the groove behind the collar and nearer the head of the screw?
Thanks

[aj81spider]

I may not be helpful, but I'm rebuilding a DMSA right now and on that the O-ring sits under a little metal circle that sits on the body. The spring and idle screw then go through the metal ring.

Don't know if the ADFA is the same, but from the diagram in this thread it looks like it:

http://www.fiatspider.com/f08/viewtopic.php?f=5&t=17622

[Scotsman]

Dear aj81spider

I just saw your reply. Thank you for your info.