Got a 2012 259B3. Left joystick (track control) has some play in it. With the boot removed, there is visible space between the lower plate on the joystick assembly and the valves. Doesn't look like it's adjustable. Wondering if there's a serviceable part (u-joint?) or if I have to replace the whole assembly. Considering shimming the plate that depresses the valves with a piece of sheet metal to take the slop out of it...