Thanks for that link, but I don't know that they can help me.
but, here's the email I sent them:
I've been purchasing and using Addi Turbo circular needles for years and years and years. I do not have original packaging or receipts.
Hence my problem, as I can't return or exchange my needles as I have so many and they were bought in so many different places, that I couldn't even say where each one was purchased.
So here's my problem: the tips of some of my Addi Turbo circular needles have become scratchy. Like they have a little chip on the tip. Is there a method to fix this?