I'm trying to build or buy a knife guard for my jointer (G0490) that is not the porkchop design. I recently notice a G0660X and a G0675 for sale used and neither have a porkchop guard, but instead have a sliding guard attached to a long (spring loaded?) arm. Unfortunately buying the parts from Grizzly is out as they have discontinued replacement parts for the guard on both machines.Does anyone know where I can buy a retrofit guard like this or have plans to make one?