Thanks for your comment. To answer your question about accessing the motor brushes by removing the back plate power interface. Unfortunately No. The Motor Brushes are located on the top and bottom of the motor. The top brush is accessible by removing the blue top cover and the bottom brush is accessible after removing the base plate. The brushes are under a clear soft plastic cover. However, I suspect the brushes can be removed and new brushes installed with the use of a special tool that can reach into and grab hold of the brush spring anchor. I've never seen such a tool. Just to note, even when the motor is removed and on the workbench. It is a tricky task to remove the brush spring anchor without damaging it. Also, when the brushes are worn down the generated particulates sometimes hinder the new brush to slip freely in it's way. I have on a couple occasions have restored machines that at one point have had brushes replaced and the spring anchor was improperly seated which caused uneven wear. I've also come across instances where one of the brushes was stuck also causing the other brush to wear down more. Removing the motor from the machine to replace the brushes it a bit tricky also and after reassembly, re synchronization would be required. So if your local Elna techy can replace your brushes without removing the motor and overcharging you. That is your best option.

Thanks for your kind comment. It is very satisfying restoring these fine machines so they operate like new again. The design of these Elna Supermatics are genius. The fits and precision of the parts are top quality. I sell these restored on craigslist, I'm located in Elk River, MN. My customers all say they love these Supermatics and have trouble finding good repair servicing.