My problem is whenever I work with coppoer compression fittings, I never seem to get a good seal and something always leaks. Are there any tips on how to do it right? Should I use a hack saw verse my Reciprocating Saw to cut the tube? (SLow vs Fast).

I know the cut has to be straight, then slide in the screw part over the tube and then the "flange". Then connect it to the male connect and then tighten. I also always use teflon tape on the male side.

How tight should it be?