Huskyvacs, it doesn't really have a smell to it, as the jar seems to be pretty well sealed. Most moth crystals used in vacuum cleaners back in the day were pure paradichlorobenzene, except Electro-Hygiene added a scant amount (0.4%) of formaldehyde to their deodorizing crystals, claiming that it "killed the germs in the air while you clean."
Thanks Les, that's what I'm working toward, making all my machines as complete as they can be.
Andy, I have a 77 too, and just last year I found an Attacha-Carrier and all the attachments I was missing for it, except the wands.
Jeff