We used Spark Erosion to repair a large tool, using our largest Sodick sparker, the AG100L, which can take pieces up to 5,000 kg.
A&M are one of a select group of European sub-contractors who have the AG100L, which is Sodick's largest capacity spark eroder.
https://www.sodick.org/products/die-sinking-edm/ag100l.html