Ok, so I bought these http://www.overclockers.co.uk/showproduct.php?prodid=WC-107-EK&groupid=962&catid=1529&subcat= and this http://www.overclockers.co.uk/showproduct.php?prodid=WC-048-OE&groupid=962&catid=1530&subcat= now I can get the tubing over the barb easy enough, but I can barely get 1 turn on the compression?????? Have I ordered the correct size tubing? I have used smaller compressions and tubing before so I'm pretty sure I know what I'm doing.