I just picked up an ultravac and was wondering why theres so many extra parts? I received an extra plastic housing for the blower assembly, one of the brackets that bolt to the big weights and sits on the caster, tons of extra hardware, an extra plate weight. I think thats all. Are they supposed to come with the extra plastic housing incase you break yours or something? I never knew it came with it and the books aren't saying anything about it.