Monobloc Mystery Screw

[C15S]

I have a 1962 C15S Scrambler fitted with a 376/258 Monobloc.  There is a threaded hole, sealed with a brass screw, next to the Pilot Air Adjustor Screw that appears to have no purpose.  The hole seems to go nowhere.  Any idea of its purpose?

[rhyatt]

Isn't this meant to have a screw on cap on it.
The brass screw you describe has a screwdriver slot in the top of it.
Part 18 is it
https://www.google.com/search?q=amal+monobloc+diagram&oq=amal+monobloc&gs_lcrp=EgZjaHJvbWUqBwgEEAAYgAQyBwgAEAAYgAQyBggBEEUYOTIHCAIQABiABDIHCAMQABiABDIHCAQQABiABDIHCAUQABiABDIHCAYQABiABDIHCAcQABiABDIHCAgQABiABDIHCAkQABiABDIHCAoQABiABDIHCAsQABiABDIHCAwQABiABDIHCA0QABiABDIHCA4QABiABNIBCDk4MzNqMGo3qAIUsAIB8QXdO2LYX90rig&client=ms-android-samsung-ss&sourceid=chrome-mobile&ie=UTF-8#sv=CAMSahoyKhBlLTdCZkhfa240cW12SmVNMg43QmZIX2tuNHFtdkplTToOczdFVkp5emNzQ0U3YU0gBCowChpfM1dKQ2FiakJIWTdyaGJJUDJlX1VJQV80MRIQZS03QmZIX2tuNHFtdkplTRgAMAEYByDKvPSkATABSgoIAhACGAIgAigC

[cdsdorset]

Looks like the pilot air jet locator.

[JulianS]

I think this is what you mean. It is the "locating peg for jet block". Amals wording, part 376/070

[C15S]

Thanks for the responses.  I see that the brass screw does have an unthreaded portion at the tip as though it is designed to plug the passageway.  I am having a heck of a time getting my ETS-based electrics to work.  My concern is that it is somehow blocking fuel flow.

[C15S]

It is not part 18 on a 376.  That goes in the bottom.  This goes in the side right next to the Pilot Air Adjustor Screw.  I think it is part 22, the locating peg, but what does it locate??

[JulianS]

See my post above. It locates the jet block into which the jet holder screws.

[JulianS]

The jet block can rotate without the peg. It does not block or even get near a fuel passage.