I have just put in some plumbing, one part of which is a compression joint to 22mm pipe, that screws straight into a 3/4" brass fitting.
This screw in joint is weeping very very slightly.
The easy way out is to unscrew the compression joint, and then re-do the screw in bit with more PTFE tape..and then re-screw the compression joint..
I never like re-screwing up a compression joint though, although this one is not totally rammed home.
To remake the pipe that goes into the compression joint is flipping awkward, so I am inclined to take the risk as a shot to nothing really..
What are your experiences of unscrewing a 22mm compression joint and then re-using it without a new olive??