John I gave u a nos one.. It's prolly not the grommet, but plastic washer or the top piece of your joystick assembly.. The top piece should be a diamond, if it's worn out you'll have slop.. Plus you should change the grey actuator at the base of the stick.. If none of that works, then wrap your stick with a bit of tape where it fits into the grommet.. Then you'll be nice and tight.
Grommet is just one part of the problem.