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Carburettor O rings

Hi, is there an easy way to get the small O rings into their grooves on the concentric air adjusting screws. I have a proper fight with the things and find they have split on the inner diameter.
Cheers
Gary

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This sounds like poor quality "O" rings to me that are too dry having the elasticity component diminished hence the cracking either that or they are old and therefore knackered.
With good "O" rings a light lubrication is all that is required.
Try putting them on from the pointy end this always works for me running them over the threads will not damage them in any way.
 

 



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