There are active communities like Vintage Toyota Sewing Machines or Toyota Sewing Machine Owners . In the "Files" section of these groups, you will almost always find the 2400 manual uploaded. Bonus: The members can answer specific questions about oiling ports.
This is my go-to site. Search "Toyota 2400." They host a clean, searchable, indexed PDF. You can view it in your browser or download it for free (you might need to click through one "premium" ad, but the download is free). toyota 2400 sewing machine manual pdf
Buttonhole:
Have a tip or a clean scan of a rare Toyota 2400 variant? Share it in the comments below to help fellow sewists. There are active communities like Vintage Toyota Sewing