Well, I decided not to buy the Elna I viewed today. It was a 68, by the way. There was a woman at the thrift shop who was very knowledgeable about machines and she put it through its paces. She said it was very "sludgey" and needed a tune-up, although she said the motor sounded good. The zig-zag didn't work properly (hardly any zig, no matter what the setting) and the tension was off so that the fabric bunched a little, even with a straight stitch. She was willing to drop the price to $25, but estimated a tune-up would be $75-100. I just couldn't justify that.
Oh, well. Need any cams?