I think the Elna motor can be accessed by removing a cover in the back. The motor axle is, as I'm sure you know, the part sticking out with the pulley where the motor belt is fitted. If you can access greasing points and perhaps do some cleaning of the copper part (the thing that spins around generated by the electricity) it likely will run better. There is a
Vintage Elna Yahoo Group with a few very helpful experts. If I found a good service guy willing to take on the job, I would not hesitate.