Special venturi grub screw on the Weber 45DCOE (only!) carburetors.
Please note that this is ONLY used on the 45DCOE and NOT on the 40DCOE or 48 DCOE.
The head is pre-dilled to facilitate securing by safety wire.
It also uses tab washer 52155.003 (number 24 on the drawing).
Required quantity per carburetor: 4
This is item number 28 in the drawing.