It looks like one, possibly 2 of the inside corner pieces have been damaged. It also looks like they are part of the large corner piece because that would be the only way to make this fully adjustable.
Depending on how the large corner pieces are built there might be a way to remove the damaged portion of the corner pieces and mount new inside corners for the router collar to ride on during use. This would also lend itself to making special pieces for the inside corners so you would not be held to the rounded corners like it was designed.
Depending on how the large corner pieces are built there might be a way to remove the damaged portion of the corner pieces and mount new inside corners for the router collar to ride on during use. This would also lend itself to making special pieces for the inside corners so you would not be held to the rounded corners like it was designed.
