Sanitaire Vacs are cheap the all plastic can be had for under 130 quick kleens under 200.00 on the net and they last forever
my oldest sanitaire is 9 years old it was the sole vacuum in the shop for the first 4+ years. we used it to dust the back of rugs as well as the front and received hours of use a day not surface pre-vacuuming on w/w jobs. Bags, belts, and center pulley nut are all that has needed i was replacing the center nut about every 8 months the metal nut would wear down and the belt would slip ..maybe the fan blade sucked up a bolt and needed replacing ...but it might have been the newer Vac?
i keep 30.00 bucks or so of parts around and a big bag of belts