A few of us have wondered what the missing part(s) might be that left us with the set being recalled and back ordered for quite a while, and it seems despite the set being recalled to fix this, that my set which arrived by mail the other day only had one of the two wheels that held the propeller blades in place, identified as part number 4299119 in the back of Lesovikk’s manual, or the wheels that were used to create Umbra’s “roller skate” feet. This part being uncommon to BIONICLE® sets, you may want to wait a bit longer to order or buy Lesovikk or be prepared for the risk of finding yourself with this missing part, but if you know a cheap set with the part or know about OTHER missing parts from the set, please let us know. If all else fails the LEGO® company will gladly replace the missing parts if you go through their customer service at www.LEGO.com ,