Just because one Durabelt measures thinner than one Eureka belt does not mean the same variation does not exist in the reverse, or within groups of either Eureka and/or Durabelt products.
Also, it is possible there has been an upgrade in materials and a thinner belt results in improved performance.
As for the breakage issue, I've suffered the same headache after replacing all of the user replaceable parts (roller brush, bag, filters, belt), and performed what I thought was an appropriate cleaning of the track areas for the belt, and roller brush--in an attempt to make the BOSS happy.
After putting it all back together I went through two genuine Eureka belts in a matter of minutes, only to find myself considering the purchase of a new vacuum.
After scratching my head over the "this is far from rocket science" problem, I found reports of motor spindle/pulley misalignment and short lived belts as a result, so decided to look more closely into this area of the vacuum.
And I did not have to look very far. . .
There was no misalignment (which would require a hit likely to cause damage beyond a pulley misalignment), but I did see where I missed what turned out to be the cause of short lived belts, no matter the brand.
Additional light helped me see what became obvious, but without this light hid unseen around the motor pulley: a build up of old belt remnant fragments and deposits (think plaque and tartar).
A thorough cleaning followed with tweezers and denatured alcohol--and the Durabelt has, as would be expected given it is a Eureka (Electrolux) product, brought the 12 amp beast back to life.
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