It is easy when you want that march dream like you would not be in clutch, with the unarmed box difficult but you will notice that this game or very spent.
Look a bad synchronizer is detected like this, you take the piñon and the incronizer the loads against each other gently and when they turn it they must hit each other, that box is the same as the border and I think it was necessary to take only the selector, if you have doubts or problems consult my mail if you want