<VV> Carburettor question(s)

[David B. Neale]

My car is a '65 Monza with 140 HP motor. I am currently re-building the 
carburettors, both primaries and secondaries.

I am somewhat bemused by the Power Enrichment Needle.  On Page 6M-4 of 
the '65 chassis manual, it is shown, rather vaguely, as being inserted 
inside the spring against which the accelerator pump pushes.  Looking 
down into the well, there appears to be no natural seat for the power 
enrichment needle.  It all seems rather odd.

I have a pair of spare primaries from another '65 car, which I know were 
is service for a couple of years.  The power enrichment needles are not 
present, but the car ran well enough nonetheless. 

Would one of you knowledgeable people please advise me regarding just 
how that needle seats; and what effect one might experience if the 
needles are missing?

Many thanks,

David