Metal stitching and metal locking a highly recommended methods for repairing cast iron cracks. The industry recognizes that the metal stitching method is a more effective way to repair casting defects and is used extensively. Cast iron crack repair by metal stitching and metal locking process is highly recommended. This technology predates the industrial development of cast iron casti... https://www.connectingrodrepair.com/blog/cast-iron-crack-repair/