I wasn't sure if this "generic" would work with my D25. One review said the product didn't fit. The product arrived 1 day early. Good packaging, minimal instructions - but enough. The installation itself, including installing a new belt, took less than 10 minutes. The package contains two identical stubs, but only one is needed. I don't know why they sent you two? I spent about 40 minutes thoroughly cleaning the interior of dirt, dust, and debris; Nooks and crannies in the vacuum head, engine…