Still the engineer is the person to ask "before" you are serious about it. IF someone has been through it recently and they have been told what to do by the engineer it becomes "their interpretation" of the "engineers interpretation" of the rules.
I could have made 5 x calls to engineers and typed 2 emails for less total key strokes than the replies here have taken.
The modern world of Internet Forums, email and drive through maccas has led us to be so impatient as to start a thread in a Forum because the engineer was not available to answer my call when I had a thought about a good conversion......