Hi,
I'm not sure about the spring either. It could easily cause more problems then it fixes.
Both the needles and primer caps I bought from Carbymaster now work perfectly even though in both cases they seemed to stick when brand new and viewed on the bench not in a carby. I think the presence of fuel might harden the rubber slightly and of course in a carby there is a small head of fuel above.
One thng I have found useful is to use the transparent yellow fuel hose. When all is good you can see the bubbles move then stop when the fuel is turned on. If they keep moving you have a flooding problem or if they do not move at all its sticking. A bit much for average Joe Blow I suppose.
I think Carbymaster should be applauded for his perseverence and ingenuity so far.
All the best
Jeff
