At 19:20 29 June 2019, Wade G wrote:
I tried a hooked piece of safety wire to no avail.
Very slim chance the thing went flying when I pulled it out but being on
black gritty pavement, no way to find it.
Wonder if sending some air through from the other end (with
EVERYTHING
disconnected from instruments) would be worth it.
And, unfortunately this discussion is starting to sound Freudian.
Wade

There is some guidance on changing the adaptor o-rings (but not probe o-
rings) on the ESA website

https://www.esa-systems.com/en/suppo...tions-answers/

plus the option of a contact form for advice