If I'm not mistaken the Janitronic came out in the very late '60s. I was told by the Rep at CWP that he'd asked Kirby for the drawings and mesurements for the 18" brush roller and was told that they had been tossed out years ago. I'm supposed to take some pictures of mine and send them to him. I may offer to send mine, so long as I get it or a replacement back.
Justin