Hi Basis and Mod CJ,,
Nothing inside a 33 or 45 is painted apart from the chassis side plate that is visible when the chain cover is removed. All parts were left in straight steel and as you'll always have oily vapours floating around in there you'll find nothing will rust if used regularly. I've seen machines that haven't been used in over 10 years reveal perfectly rust free components when the cover is first removed.
Cheers,
BB.