Now I've got the 6 sockets, am able to use them with rooter but can't find out which is the right one
Look at the vent (stand close to it) and it will zoom in. And give you a better look at the bolt.
Or ... just trial and error if you want to go the long way! :D
I have 5 biig bolts and one small bolt so which one is it?
If you stand close to the vent and do the "eye" icon on it - it pops out a picture. You should be able to tell by looking at that and then looking at the bolts as to which one is needed.
