Guy King wrote:
The message
from "." contains these words:

Th olive should be tightened enough to permanently deform the pipe.

eh ?

Seems clear enough to me. The clamping by the nut should tighten the
olive onto the pipe sufficiently to indent the pipe all the way round
- that's how they work.

/deform/ the pipe (sic) ?

overtightening the joint deforms the /tube/, that's what causes leaks.

a /light/ touch of jollop, good control on the static part of the joint and
knowing when the joint is nipped up all takes experience and it's for
that reason that them who are not dealing with compression joints
day in, day out should take the time to learn how to solder a joint.

YMMWV, of course.