Why bother trying to make the old, worn out and possibly corroded carburettor assembly work smoothly and correctly, when a new one is still available?
Fitting a new carburettor will save hours spent on problem solving and trouble shooting that is inevitable with a decades old carburettor assembly.
If a new assembly is no longer available, then check our carb schematic. You may be pleasantly surprised at just how many spares we are still able to supply?
Alternatives:
Don't waste time trying to refurbish the old item, simply replace it with a brand-new part instead, whilst they are still available.
Add as many parts as you wish to the same shopping cart, new inlet gaskets, nuts and spring washers for example, and still only pay the same single fixed price shipping cost.