With the additional strength of the aluminum upgrade parts your broken bits should be mostly limited to blades... blades... and more blades. They snap like twigs when there's nothing else to give. Keeping an extra flybar on hand is probably a good idea as well. I have more fun throwing my CX2 around than playing it safe so I usually stock 5 bags of upper & 5 bags of lower blades just to keep trips to the LHS down. One of the more expensive aspects of this hobby, at least for me, is stocking the home workshop like my own private hobby store. Sure it costs a lot to do so (roughly a few hundred dollars of spare parts in reserve at my home for both my CX2 & CP Pro), but it's worth it when I need a part and only have to go as far as my parts drawer to fix it. Of course you don't have to do this but as I've found myself making multiple trips to the LHS in a single day in the past I do it just for my own sanity. Besides, driving on the roads today with all the crazies to get groceries is scary enough!