The owner's manual
(leaflet) over there.... clearly states: For optimim perfoemance, it is impearative that you use only GEHUINE HOOVER parts.
They really DO make the world of difference. Non-HOOVER belts were used in a Convertible, and, it strained too much, etc...it was NEVER the same, again. THe Converyible was named that way because ,:All you have to do is insert the attachments and the motor clicks into high-speed. It "converts" into an above the floor cleaner. Thus....CONVERTIBLE. The Dial A Matic was a bit different. You could insert the hose to clean above the floor. But, THe DIAL set the suction strength. There were different strength for FLOOR cleaning, OR for TOOL use. You simply turned the DIAL. There is "lesson ONE' in American HOOVER. Quiz tomorrow, lol.
John