Kubota Draft Control Linkage

[Barneyhunts]

I have a three year old Kubota L4240 with draft control. Part of the draft control feedback linkage is a "holder" which slides on the spline of the shaft between the upper 3pt. lift arms(above the hydraulic cylinders) and a "stopper" a device which snaps into the snap ring groove and keeps the holder on the spline....stops it from sliding off. Unfortunately, I've lost two of these "stoppers" in the past three years and wonder if any other Kubota owners have encountered this problem and how they've dealt with it? Without the stopper the holder slides off the spline.
Thanks,
Barneyhunts