Front Wheel Stabilizer Mod
This modification reduces the front wheels tendency to shake back and forth when traveling over rough terrain.   This cost about $30 and virtually eliminates this problem.   It will reduce the wear and tear and possible breakage of the left front steering knuckle on the older JMs.   It reduces the load shock back up through the steering components caused by rough ground conditions, such as pot holes and trenches, especially with a loaded FEL. 
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Warning!  User is responsible for all aspects of making this modification to their tractor.
Left side mounting to tie rod.
Right side mounting to frame.
Thanks to Jeff for providing pictures and info on this mod.