3406b valve set

I normally use a torque adapter like this:
Seems to stay on the jam nut better. Key is to make sure you point it 90° out to the side of the torque wrench so that it doesn't affect the torque setting. Out the front would over-torque it, pointing it straight back would under-torque it.

 

I think setting lash on the jakes requires either a special feeler or two sets so you get an accurate reading.

 

It's very basic, just need to get a feeler under both sides when doing the jakes and make sure you're setting correctly for your application.
I use a wrench and a screwdriver with two feelers for the jakes and haven't had any problems yet.
Just be certain of your make and model of jakes to get the proper lash setting as that's crucial.

 

Those are Jake's. I thought all B's set @ 30. Maybe @wore out can confirm