I am talking about the slate covering at the pocket openings close to the slate radius.Are you talking about the slate pocket of the tables? Because that all depends on what kind of tables you're talking about. Or, are you talking about inside the pockets on the facings of the rails? If this is the case, that happens because the facings are either worn out, or 1/8" thick. If the facings were 3/16" neoprene to begin with, that would never happen.
Glen