I'm in the process of rebulding the carburetor on my 1973 Mercury 7.5 HP with Mercarb BB series carburetor. The idle tube's screw head stripped off, so I need to locate another one. The trouble is I'm not sure what the part numnber is. I've found the attached parts diagram on several sites and none of them list the part number for '39', which is the part I need. Could anyone tell me what the part # is, and / or sugguestions about the best route to finidng one? So far I'm thinking ebay is probably my best bet.
