I am sorry BG, but you cannot have the ZXX version of the Shuttle. The ZXX version already comes with the top start one-way bearing system. To convert to it would cost you well over $100.00 and to upgrade other items (out of the z-bends to ball joints everywhere) maybe another $20.00. etc.etc.

Been there done that. At the end of it, I followed a friends advice (I should have in the first place) and bought a Hawk IV ($220)with the BB upgrade ($22) and now have a heli that flies a lot better then my Shuttle (with more money then that just in upgrades !!!) and costs a lot less to repair when I get disoriented