I recently bought Barrow compression fittings (http://www.aliexpress.com/item/Barrow-Silver-G1-4-one-third-3-8-thin-tube-hand-tighten-fittings/1165895280.html), but when I tested if it fits my tubing, it doesn't seem quite right. The compression ring doesn't push against the tubing at all - its too wide. It seems almost as if the fitting were made for a thicker walled tubing, but it was advertised as 1/16 thickness (I have 3/8 - 1/2 tubing). Am I doing this wrong? Should I open a dispute with the seller for advertising incorrectly?