Carburetor question for 66 VW Beetle.?

It sounds like your carburetor rebuild has lost a "PLUG". Yes there should be a metalic plug in that nickle sized hole. How does the engine run with a bigger air intake? Do you see any gasoline leaking out of this hole at any time? Contact J.C. Whitney at TEL: (800) 529-4486 or on line: for a catalog of VW parts and accessories. Or contact your nearest VW parts dealer.