I recently undid the 2 plastic nuts and took the wear plate off and peeled the plastic arch back from the inner wing.
Behind the plastic was 10mm of hard dry soil/silt - helping to push the plate forward into where the wheel should go.
Clean it away from inner wing and back of plastic arch.
Push your thumbs into the wear site on the plate and bend it a little more than it is already.
When U assemble, the action of tightening the nuts straightens the plate and forces the recessed are to push the now cleared plastic arch back to meet the inner wing. Creating a little more space to reduce rubbing.
I sprayed the wear mark black hammerite smooth - to enable me to guage if wear still happening.
I also use the Fe balance masses (self adhesive type from alloy wheels approx 12 x 15mm rectangle) drill a hole and use as a backing washer to pad out the wear block by thickness of the balance mass.
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