There are clear instructions by ESA at
https://tinyurl.com/ESAFAQEnglish
which suggest cleanliness, light lubrication, and give
orientation advice also. Just saying.

At 19:28 15 February 2018, Charlie M. UH & 002
owner/pilot wrote:
Yep, agreed.
Store the probe so it stays clean (lot of times we use
one of the ASx side
=
cockpit vents, also helps keep peeps from dropping
something on it.....),
w=
ipe it off a few times a year, very thin smear of lube,
twist while
install=
ing.
Yes, the "witness mark" tape is nice. If for some reason
the probe sorta
"h=
angs" on install, you may have a huge system
leak/cross talk if it's not
fu=
lly seated. Yep, did a spring flight like that once, helped
fine tune my
bu=
tt vario...... Just twist it in until the tape is against the
tube in the
f=
in, align the angled probe as required (some say
straight up, some say
stra=
ight down....).