Cat sixty Ensign carburettor

The Ensign model number is AAe. That model information is stamped on the rim of the upper flange.

I don't quite understand what is missing? The high speed adjustment needle and spring is under the knurled cap (top center) in the picture.

The scan below is from the Operator's Instruction Book for Caterpillar Sixty Tractor, 1931

[attachment=52432]carburetor page.jpg[/attachment]

[attachment=52433]operator instruction book cover.jpg[/attachment]

Thanks phildirt
There is no high speed adjustment needle and no spring under the knurled cap named "G" in your scanned photo, they are missing. Are there any reproduction needle and spring to get hold of?
/Erik

Please, can anyone tell me if and where I can find a new high speed adjustment needle to a Cat Sixty Ensign AAe carburettor?
Thanks
Erik

Here is a picture of what you need.

The shaft is .125"

Should be an easy job for a tool and die maker. The spring only holds tension so the cap doesn't come off.

[attachment=52434]002.jpg[/attachment]