hmm and using them isnt hard??... i dont understand how they work if the spoke hole diameter is off... do you stick them in the hole?

where do i buy them?.. i cant find them on Harris or Niagra cycle. (im a canuck too so if you have a Canadian retailer that would be nice too)

Edit: hmmm... I have seen some posts now about people who use these on all their wheel builds... are they crazy or does this make sense.