They are in the bag with the purple caps if I recall correctly. Another thing to do in addition to the tightening key is to use something grippy to hold the needle and tighten it. I use a small piece of grip shelf liner. Like this-
Thanks for your help. I was expecting something technical and all you do is use the key to tighten the screw. I really like this site, everyone explains things so well.
Jan
Like the idea of the shelf liner too as my hands dont grip all that well. Thanks