I was a bit lucky when I bougth mine. There is a yahoo vintage Elna group, a couple of times a year some of the guys there have said they are making up a few metal friction wheels and ask if anyone else is interested. Some have contacts others have their own lathe machines. It's the ideal solution if you can get it, O-rings last a long time, and are easy to replace. You will get much more detailed help on the Elna yahoo group, at least with the difficult stuff. Some of them are expert repair guys.

Great suggestion, thank you. I have joined the Elna yahoo group, so I will post there and can report back here too. It seems like that could be helpful. I am still waiting to get the machine...

I think Farmer John put a screw in to push the motor away from the shaft and keeps the tire from going flat. I saw that on Victorian sweat shop forum.