Tom,
I have the condition,..actually saw it about 12 months ago,..and have just been watching it.

The up and down movement of the d=goard against the well just sharpened the trailng edge of the d-board,...and,...yep,..it is 'sawing' into the well top.

Maybe a little West and carbon tape,...about 1 inch in width,...as long as it is something harder than the d-board material,..

...any ideas out there?


regards,
Bruce
St. Croix
#50