The fitting is supposed to squeeze itself down on the line the first time it's tightened, creating a small crimped area in the line. Yours has obviously been tightened too many times and is no longer capable of functioning properly, or the end of the line is compressed to the point it can slide through the fitting freely. These fittings were intended to be "one time use" items, and should be replaced if they ever lose their grip on the end of the line. The tubing should protrude about 1/8" or so through the fitting into the oil distributor so there's an area for the pointy end of the fitting to grip. There is a way to use a regular compression fitting with a ferrule instead of the scarce special fitting, but it involves some rethreading of the oil connector for a 1/8" pipe thread. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!