So I'm rebuilding a wheel (swapping the hub), and the spoke nipples keep stripping! Especially when I'm working on the vertical true, I get loud pops, and the threads on the spoke nipple strip. What gives? I can think of only two possibilities:

-Is it bad to re-use nipples?
-Am I overtight? I don't think so, but I have no tensionometer. The nipples aren't THAT difficult to turn, either.

Thanks