How do you measure ERD on rims that have internal nipples?

For edge rims qbp says use the erd and add 8mm to the spoke lenght

How do you measure ERD on rims that have internal nipples?

Great thread . I'm new to wheelbuilding as well, so this comes in very handy.

My first try will be a rear wheel for a fixie build. The hub is a Miche Xpress (track style) hub, the rim a Mavic CXP33.

Is it OK to use a rim from an old wheelset, as long as it's still in good shape? (have a ultegra9v/cxp33 wheelset that's collecting dust)
And the nipples, can they be recycled? If so, I'd only need new spokes, since the Miche hubs have higher flanges..
With 32h and no dish, this should be a straight forward build, right?

I was given this tip by an experienced wheelbuilder at East Street Cycles in Farnham (UK). He recommended using linseed oil at threadlock.

I have been doing this on a number of wheel builds recently and it works really well. I dip the thread of the spoke in linseed oil bofore lacing, remove any excess by touching the thread to a bit of newspaper.

Spontaneous combustion

Rags soaked with linseed oil are considered a fire hazard because they provide a large surface area for oxidation of the oil. The oxidation of linseed oil is an exothermic reaction which accelerates as the temperature of the rags increases. If rate of heat accumulation exceeds the rate of dissipation, this reaction may eventually become sufficiently hot to cause spontaneous combustion of the rags. Linseed oil soaked rags should never be stored, least of all in an enclosed container. Instead, rags should be washed, soaked with water, or incinerated. A fire that destroyed the El Rey Theater-Golden West Saloon in February 2008 was ignited by the spontaneous combustion of linseed oil soaked rags left in a plastic container. [19]