The pressure bar has become detached from the lever of my Waterman 0552 1/2V. I'm having a great deal of difficulty getting the grooves at the edge of the pressure bar to slide back onto the end of the lever. It may be that the little protrusions on the end of the lever are bent out of shape or that the grooves on the pressure bar are bent out of shape. I won't really be able to figure it out and fix the problem until I can remove the lever from the barrel. Does anyone know how to do this safely? It is not obvious from just looking at it.