by wrcompositi on Sun Dec 15, 2013 4:38 pm
Both CN and Pillar make this kind of nipples, licensed by American Classic.
CN's part no. is ACC144, Pillar's is DSN.
I like this design and use them on most of the wheels I've built. The spokes thread deeper into the nipples, eliminating the likelihood of aluminum nipples snapping around the necks. The nipples can be turned on both ends, and it's easier to tighten with a T-shaped 3.23mm spoke wrench from the side of rim bed.
Moreover, the spoke length doesn't have to be very precise, just add 1-2mm to the results from spoke length calculators when using these nipples.