Anti clockwise to reduce the power and it gives less tension on the spring. You may have a locking grub screw to remove first.
I use a grease on the bolt myself once a year just before the Winter season Lubro Technic SG2 according to the pot which I brought about the 5 years ago. I do not put anything on the probe itself.
Trigger I had set up by John Ostler when he serviced so I have no clue on that I am afraid.