OK, I have a model 77, the picture of the day. Now, I do not have the "optional" tool caddy. This is where I need help---It seems that the only (third) support for the machine, the big wheels being #1 and #2 is a felt disc on the bottom of the machine. I buy junk on Ebay and other places and re-store the units. That's where I get my fun. But sometimes don't know if I have the whole thing or not. I have seen Rexaircollector's Golden Big Wheel, and that has a rear swivel wheel, but is attached to the tool caddy. Is that felt disc all there was if you didn't get the caddy??? Any help would be greatly appreciated. This machine is next on the re-build list. Thanks, Rick.