I bought a few old Elna bobbins from Helen Howes in the UK A set of 12 is a minium for me on machines I use and I adde a few to fill up the accessory tray. They have the groove in the hub, I'm not sure your model requires it. Postage isn't too much on a few bobbins, but I guess there's always better offers to be tracked down. For the 66 bobbin, you might have to wind it on another machine, you will notice. Elna bobbins are right-side-up with the holes upwards. The bobbins have to go in the right way from which it is wound and the bobbins are made to make it easy to tell the difference. You have to make a point of pulling the bobbin thread down behind the bobbin case and properly into the tensionspring.
You probably have to clean it, mine was packed full of lint and dust. I think the top comes off on your machine as well as the top of the freearm. The face plate is hinged in the back and slides open, make sure the presserfoot lever is down (at least it's so for my Supermatic). The paint is a delicat on these, much the same as on vintage Bernina models. I used resin type polish for cars on mine, with the hope it might protect a bit.