Originally Posted by
spaceworm
I find it hard to believe that the threaded tube and the disc/spraybar are one piece. It would be a major job to machine all the excess metal away and also to thread the threaded tube all the way up to the disc. Expensive operations for an inexpensive engine.
I would suggest double nutting the threaded tube and then while gently securing the spraybar/disc, see if the threaded tube will separate. I would carefully clamp the disc around it's outer edge so as to not mar any of the critical surfaces. Someone else earlier suggested this.
Good luck.
I don't think it's one piece either, however if this is a very early engine with o-ringed head, it's possible they did machine it as one piece and only later changed to the threaded mixture disc.. I don't know the entire history of the lineup, so I can only speculate.
I was was the one that suggested double nutting the tube. I agree it's still worth a shot to try it.