Unlike other AAs which appear in your AA window Rylin will give gnomes a task to complete in return for 3 books which can be right clicked to get the Tinkering Mastery AAs.
you say "hail, Rylin Coil"
Rylin Coil says, 'yikes! Dont startle a fellow like that! Have you come to peruse my fine wares or are you looking to be taught the arts of [tinkering mastery]?
You say, 'tinkering mastery'
Rylin Coil says, 'Very good. We gnomes should all learn this fine art. Those that do not, I am not sure if I should even call them a gnome!
you have been assigned the task 'Tinkering Mastery 1'
objectives
create 1 stalking probe using tradeskills
deliver 1 stalking probe to Rylin Coil.
on completing the task..
you have shown Rylin Coil your work
Rylin Coil says, 'That looks very good! Here are the books you will need to learn Tinkering Mastery'
make sure there is room for 3 items in your inventory
you will get all 3 books at once