Depending on the price of CCH and shipping, it might actually be less expensive just to purchase a NOS Hammer & Trigger - while they are getting harder to find in new condition now days, they are still available on ebay, G-broker, gun shows, parts guys, etc.
If yours was polished and blued that means the original spec's have been slightly altered as well. I know it's picky, but polishing does remove metal and so there's another good reason for NOS replacements.