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They must have sent you specials jo as all mine seem OK. Have you let Ketan or Iain know. Hope that big ears and the elves has not been putting them in the wrong boxes. 4-flute is not ideal for slots anyway.EDIT just saw the photos and its the cheap ones you have, better to stick with the premium, no wonder you were given them, what is it they say about beggers?
this time I use a specialist tool (vice)
I left it a smidgen (technical measurement)