Imagine using this floor polisher in the link the sand loors. Almost impossible to control.
https://www.nilfisk.com/global/professional/news-and-articles/celebrating-nilfisks-110-year-anniversary/
I wish you luck in finding ultrasilencer parts. Maybe beam could get you some if they bought the old stock when the transition hapened if it is that type of power nozzle.
It is a shame how old vacuums justgetthrown away. I hope to find 200 electrolux machines in a shed soe day. I will probably have to find a new collector thatis just getting into properly collecting in a few decades. Getting rid of hundreds of vacuums in a small city of 400,000 people would ruin...