As long as the heads are set up correctly and the bore is precise, you should be able to drill them out from .355 to .370. Form Forging is nothing more than investment casting of carbon steel, followed by one hit in a forging press. I don’t know which particular model you have, but the CG1, CG2, and CG4 models were a material that was not just a carbon steel. It was infused with another material that made these models brittle. The later models of CG10 and CG11 wedges were also difficult, if not impossible to bend. The other models of Cleveland irons we list on the non bendable list (TA2, TA7) had the micro cavities in the top of the iron cavity that would collapse when you locked them in a bending machine and then tried to bend.