Don't have that model but had their SU62 back in the 70's. Loved that machine and the fact it was basically all metal. Sold it when I got my Viking Designer1 and have been kicking myself ever since. Tried to buy it back for twice the money and the lady wouldn't part with it. Guess she knew what a gem she had.
Elna made a great machine back then. I have one of their sergers too and have never had trouble with it that wasn't my own doing.....basically threading it. Now I keep it for 3-thread only and picked up another serger for cover stitch. This way I don't have to rethread either one.