Charlie,
There's a problem between my internet provider and yours.
So here is my message:
Charlie,
First of all, it's difficult to answer your question because I am not fluent in English, as you understand, reading my previous mails.
Thierry and other people in the forum said that it's extremely dangerous to maneuver the machine, at the end of a row, without disengaging the miller.
To be quick, they say that you should have to disengage the green (I suppose) hooks (on the hubs) in order to put the wheels in ratchet for differential action. Doing so, turns, at the end of rows, will be easier.
Alain.