Measuring Float Height with clear tube on older carbs with no nipple

Edward

1978 XS400E
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I have a '78 model where the float bowls don't have the nipple to attach a hose to. I have the carb out of the bike and want to check the fuel height before I put it back.

I believe I want the fuel level to be 2mm below the upper gasket mating surface of the float bowl.

Any suggestion on how to get a tube sealed in there so I can see how high the fuel level is getting?

Thanks!

Ed
 
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