Joint double ball greaseable

. SEAL DOUBLE HEAD WITH A GOOD LUBRICATION IN ANY POSITION ANGLE POSSIBLE THE CROSS 4 PRESENT EACH ON THEIR FACE INSIDE A RECESS IN SHELL BALL 11 CONNECTS TO CHANNEL GREASE 1 AT LEAST; THE HEADS 5 PRESENT A PROJECTION IN SHELL BALL 16, CROSSING THE ARCADE 10 LINKING EXTERNAL FORKS. CENTERS OF RECESS IN SHELL 11 BALL AND SURFACE IN SHELL BALL 16 LIE IN POINT OF INTERSECTION OF TWO LINES OF CROSS 4; THE HEADS 5 EACH CONTAIN LEAD TO A BORE AXIAL 14.