Ah, I see. Well, I ended up finding someone's sewing blog who has the 5830c and she was raving about it. I think it was made in the mid 90s, and it was mainly for high school home economics classes which means that it's durable and simple...at least that's how this blogger described it. It is all metal inside, and I know that's a must if you want a machine that won't break easily and will last a long time. I'll go ahead and check Craigslist before buying this machine as you suggest, but I also think that even if the Goodwill machine doesn't work 100% I won't have lost too much money, and I'm sure I know someone who could help with repairs.