You might get another 2mm if the nipples had the same length of unthreaded section under the flats. You might also try different brands of nipples. I know that 12mm Wheelsmith spokes and nipples thread to about 2mm above the head, but I don't know if the spoke has a bit more thread or the nipple a bit less.
BTW- I don't know if DT switched nipple suppliers, but that definitely is not an old DT nipple which had a broad conical head, as opposed to the button shaped head here.
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Last edited by FBinNY; 05-15-10 at 11:40 AM.