I believe Hy-Capacity sells the round bar and wire concaves manufactured by loewen. The wires are on these are in tightly drilled holes, so these will not hair pin like the CASEIHC concaves, whose holes are punched and are much larger than the wire size. Something else that would help, and they likely sell these also are the Marlin elephant ears for improved feeding and a concave shock kit, that will allow the concaves to move slightly downward to help eleviate the plugging problem. Hy Capacity should have them also, as I believe they carry all loewen products.