The wire belt is made to drive the winder -that is how National did it with the electric friction drive motors. That should be shown in the manual.
At least there are a lot of National made machines out there, so finding a treadle cabinet shouldn't be too hard. If you go that route, the treadle belt will also drive the bobbin winder, instead of the wire belt.
BTW - does the manual say what the initials stand for (it may on the back side)? yours appears to be a later made electric version of the IEB. I collect manuals and have not encountered one with those initials on it before, so I'm very curious.
Last edited by Macybaby; 11-04-2016 at 07:09 AM.