Okay, my husband and I bought a beautiful 1960's brick ranch home two years ago. It was built by a millionaire (back when a millionaire was really a wealthy man) so it was built well and had built-in everything, etc. It is a ranch with a walkout basement under about half of the first floor. Since it's built into the side of a hill and is brick, it is quite efficient, even with an old furnace our heating bills are just $100 per month on a budget plan. The furnace is a Williamson 5-in-1 natural gas furnace and it runs well. My husband is a terrific musician, but not much of a handyman. And that is why I'm here. Last year we had the bearings replaced in the blower. This summer a belt came loose and it was making that whiny loose belt noise. I found some on **** and my husband was able to replace the belt, so the whining stopped, but the fan is shaking/rattling when it runs. My husband says we need to replace it but the serviceman he called last year said they don't make replacement parts anymore. First, is that true? Isn't there some way if we pull the old one out, some service company could find one that is compatible? It seems like every service company I look up here in Indianapolis also sells HVAC systems and I'm thinking they're all going to say it has to be replaced since it's 20-30 years old. So, what advice can you guys give me?