That is a nice machine. I don't think it's a refurb. I think it's a 66-18 treadle. It's way to nicely done to be a refurb.
The oval gadget you bypassed with the belt is the belt derailleur. You should have run the belt through it. There should be a spring under the derailleur holding it with the oval away from you. If the spring is not there, I don't know where to suggest getting one.
I have a 66-1 ( converted to low shank feet ) in a cabinet exactly like yours. My derailleur spring was missing too and I ended up having to go to a shop in Australia to get it.
Joe
Last edited by J Miller; 04-07-2014 at 11:42 AM.