This is a photo from inside the fan cabinet you can see the shaft is buried deep inside. The shaft is heavily corroded. The entire cabinet would have to be disassembled. The shaft has been in service for almost 60 years. You can’t see the two blower wheels but they are beautiful complex aluminum cast fan wheels. Removing the shaft would be a huge task. The customer considered replacing the entire unit. The replacement cost was $80,000 with labor. We fixed it for $3500 including parts with new belts and sheaves.