Christian McArdle wrote:
What are your experiences of unscrewing a 22mm compression joint and
then re-using it without a new olive??

I've done it loads of times. It certainly wouldn't even occur to me to even
change the olive, let alone the entire fitting. I never use any jointing
compound or PTFE on compression joints.


One problem with this is you don't know how many times this has been
done.
The olive will work harden sooner or later, and stop working so well.