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retro74I was a wheel builder and mechanic for 8 years.  I just built some Stans Crest wheels using Sapim DB spokes and I used these on the drive-side with alloy nipples for all spokes.  Easiest to grease-up all of the washers and then insert the nipples through the washers as you build.  This is a great way to spread the load a little wider on the drive side and the weight is next to nothing to do so.
For carbon fiber rims, use these on ALL spoke holes front and back.