Ah, typo on my part! Yes it is a 501. So the paperwork date is accurate. Doesn't have as much suction as my upright Royal, but then again, it IS a smaller unit. I'll tear it down and thoroughly clean and polish it, as well as oil it in the oil hole.
Paperwork says use 30 weight, do you know if it matters detergent or non?
Ben, thanks for the help, I figured you'd be the one to answer, as you seem to know your Royal vacs!
Will