I'm a huge fan of Hakko products, like HUGE. So, while cleaning and organizing my lab today, I noticed I had an extra 661-1 lying around unused that needed a new rod. Threw this together and slopped it out of the printer.
Whenever my damned 4PDT switches get here, I'll have a mod to upload for the Hakko FM-204.
If anyone's interested or I eventually need more of these, I'll model the holder itself. I also have a 611-2, which will probably be the first to do.