have not even put 5 hours on this new snapper commercial ninja 21" to change the 5-hour break-in oil and it's falling apart. I think I just got a defective one or something. Anyone ever have this happen? I have a used snapper hi vac 21 with plenty of hours on it and it doesn't have this problem at all. I'm basically only posting this though because I'm linking the thread to Snapper in order to show pictures to see if they'll just send me a new 7061276YP hub driven disc kit, or if I have to go through the warranty process and bring it to a shop. And if they have an explanation. Basically the main hub with the black rubber wheel is meant to slide over a hex rod which spins everything. The inner sleeve though is falling out from vibration. It should be that the inner sleeve is welded into the main hub and never come out. It seems as though it's just friction fit! I guess I can put JB metal weld paste on it but I don't feel safe using this mower I wear safety glasses. I almost want to put a plywood shield to block the view of the whole drive system but then I can't keep an eye on it (e.g to make sure driven disc is adjusted right at max speed right on the edge of the flat horizontal wheel and not hanging over the edge which could cause a problem if it goes out of adjustment slowly on its own) and I wouldn't be able to put a bag on it with a plywood shield. sounds ridiculous but mowers scare me, and I've used pretty much every tool there is but mowers scare me, even just the snap ring holding the sleeve on could go flying despite this issue I'm having. I do like the mower a lot besides that though. Anyway, that snap ring is all that's needed to be removed in order to take the kit apart to change out the bearing - The sleeve should probably just be one-piece or welded instead of friction fit in there. I'd actually rather there were a way to omit the snap ring and just have a tab that bolts the sleeve stationary to the black metal cover over the rubber disc.. anyway before I go trying to design a new mower I'll stop.