I recently overhauled my girlfriend's 10 year old Dyson DC07 after the clutch broke and this brush was the last to be replaced. I calculated that her old brush has literally been slammed a million times through dirt, dog hair, flakes, broken glass, sand, Lego (those little transparent bits are hard to see!) and anything else you can think of. The old brush wasn't broken or anything, but I figured since everything else is being replaced, why stop at the brush? The physical characteristics of aβ¦